Identify the longest continuous chain of carbon atoms.
If a functional group is present, select the longest chain that includes the carbon atom of the functional group.
If a multiple bond (double or triple) is present, the parent chain must include the maximum number of multiple bonds.
If two or more chains of equal length are possible, select the chain containing:
a functional group carbon (if any)
the greatest number of multiple bonds
the greatest number of substituents
Step 2: Numbering the parent chain
Number the carbon chain from the end nearest to the functional group carbon.
If no functional group is present, start numbering from the end nearest to a multiple bond.
If no functional group and no multiple bond are present, start from the end nearest to a substituent.
If two or more substituents are present and no F.G. or multiple bond exists, apply the 'lowest set of locants' rule.
Step 3: Naming substituents
Identify and name all substituents attached to the parent chain.
If more than one identical substituent is present, use prefixes such as di-, tri-, tetra-, etc.
List substituents in alphabetical order when writing the name.
Step 4: Position of multiple bonds and functional groups
Indicate the position of double or triple bonds by the lower-numbered carbon atom of the bond.
If both double and triple bonds are present, give the lowest locant set to double bonds first (–ene before –yne in naming).
Functional group gets the highest priority in numbering and naming.
Step 5: Writing the complete name
Combine substituent names with their locants, listed in alphabetical order.
Add parent chain name with suffix indicating multiple bonds (-ane, -ene, -yne).
Finally, add the primary functional group suffix with its locant (if required).
S.N.
Number of Carbon Atoms
Word Root
Example (Alkane)
1
1
meth-
Methane (CH4)
2
2
eth-
Ethane (C2H6)
3
3
prop-
Propane (C3H8)
4
4
but-
Butane (C4H10)
5
5
pent-
Pentane (C5H12)
6
6
hex-
Hexane (C6H14)
7
7
hept-
Heptane (C7H16)
8
8
oct-
Octane (C8H18)
9
9
non-
Nonane (C9H20)
10
10
dec-
Decane (C10H22)
S.N.
Functional Group
Formula
Prefix
Suffix
1
Carboxylic acid
-COOH
carboxy-
-oic acid
2
Sulphonic acid
-SO3H
sulpho-
-sulphonic acid
3
Acid anhydride
-CO-O-CO-
alkanoyloxycarbonyl-
-oic anhydride
4
Esters
-COOR
alkoxycarbonyl-
-oate
5
Acid chloride
-COCl
chlorocarbonyl-
-oyl chloride
6
Amide
-CONH2
carbamoyl-
-amide
7
Cyanide
-CN
cyano-
-nitrile
8
Isocyanide
-NC
isocyano-
-isocyanide
9
Aldehyde
-CHO
formyl-
-al
10
Ketone
-CO-
oxo-
-one
11
Alcohol
-OH
hydroxy-
-ol
12
Thioalcohol (Thiol)
-SH
mercapto-
-thiol
13
Amine
-NH2
amino-
-amine
14
Alkene
-C=C-
alkenyl-
-ene
15
Alkyne
-C≡C-
alkynyl-
-yne
S.N.
Substituent
Formula
Prefix
1
Fluoro
-F
fluoro-
2
Chloro
-Cl
chloro-
3
Bromo
-Br
bromo-
4
Iodo
-I
iodo-
5
Nitro
-NO2
nitro-
6
Nitroso
-NO
nitroso-
7
Diazo
-N2
diazo-
8
Alkyl (Methyl)
-CH3
methyl-
9
Alkoxy
-OR
alkoxy-
10
Ethoxy
-OC2H5
ethoxy-
11
Epoxy
-O- (cyclic ether)
epoxy-
12
Phenyl
-C6H5
phenyl-
1. Which of the following is an aromatic compound?
Benzene hexachloride
Anthracene
Cyclohexene
Cyclobutadiene
(b)
2. Which of the following is homocyclic aromatic compound?
Benzene hexachloride
Anthracene
Cyclohexene
Furan
(b)
3. Which of the following is heterocyclic aromatic compound?
Benzene hexachloride
Anthracene
Cyclohexene
Furan
(d)
4. Which of the following is an aromatic heterocyclic compound?
Pyrrole
Pyrrolidine
Epoxyethane
Dioxane
(a) Note: Pyrrolidine, Epoxyethane, and Dioxane are heteroalicyclic compounds.
5. Which of the following is/are alicyclic heterocyclic compounds?
Tetrahydrofuran
Tetrahydropyrrole
Tetrahydrothiophene
All
(d)
6. Which of the following is not a carbocyclic compound?
Cyclopentane
Naphthalene
Thiophene
Benzene
(c)
7. An example of alicyclic compound is
Benzene
Hexane
Cyclohexane
Furan
(c)
8. Which of the following does not contain fused benzene rings?
Naphthalene
Anthracene
Diphenyl
β-Naphthol
(c)
9. A compound with molecular formula C₆H₄O has all four carbon atoms and one oxygen atom in the ring. It also has two double bonds. The compound is
Homocyclic and aromatic
Heterocyclic and aromatic
Homocyclic but not aromatic
Heterocyclic but not aromatic
(b)
10. The structural formula of cyclohexyl alcohol is
OH–C₆H₁₁
CH₂OH–C₅H₁₀
CH₂OH–CH₂–CH₂
Other
(a)
11. Vinyl carbinol is
HO–CH₂–CH=CH₂
CH₂CH(OH)=CH₂
CH₂CH=CH–OH
CH₂–C(CH₂OH)=CH₂
(a)
12. Aromatic character of benzene is proved by
Resonance theory
Aromatic sextet theory
Orbital theory
All of the above
(d)
13. Which of the following is a heterocyclic compound?
Furan
Pyridine
Thiophene
All of these
(d)
14. Which of the following is an aromatic compound?
Furan
Anthracene
Pyridine
All are aromatic
(d)
15. Which of the following is not a carbocyclic compound?
Cyclopentane
Naphthalene
Thiophene
Benzene
(c)
16. Which of the following is not an aromatic species?
Tropylium cation
Cyclooctatetraene
Cyclopentadienyl anion
Benzene
(b)
17. An aromatic molecule will
Have (4n + 2) π electrons
Be planar
Be cyclic
All of the above
(d)
18. The number of olefinic bonds in CH₂=CH–C–CH=CH–C≡N is
0
2
3
1
(b)
19. Organic cyclic compounds possessing the properties of aliphatic compounds are called
Aromatic
Cyclic
Alicyclic
Homocyclic
(c)
20. Heterocyclic compound means
A chain of C–C compounds
A cyclic compound with at least one atom other than carbon
A cyclic compound of carbon only
More than one benzene ring attached
(b)
21. Which of the following represents the benzal group?
–CH=CH–CHO
–C₆H₅CH₂
–C₆H₅CHO
–C₆H₅CH=
(c)
ADDITIONAL QUESTIONS
1. Which of the following is an aromatic compound?
Benzene hexachloride
Anthracene
Cyclohexene
Cyclobutadiene
(Anthracene)
2. Which of the following is homocyclic aromatic compound?
Benzene hexachloride
Anthracene
Cyclohexene
Furan
(Anthracene)
3. Which of the following is heterocyclic aromatic compound?
Benzene hexachloride
Anthracene
Cyclohexene
Furan
(Furan)
4. Which of the following is an aromatic heterocyclic compound?
Pyrrole
Pyrrolidine
Epoxyethane
Dioxane
(Pyrrole)
5. Which of the following is/are alicyclic heterocyclic compounds?
Tetrahydrofuran
Tetrahydropyrrole
Tetrahydrothiophene
All
(All)
6. Which of the following is not a carbocyclic compound?
Cyclopentane
Naphthalene
Thiophene
Benzene
(Thiophene)
7. An example of alicyclic compound is
Benzene
Hexane
Cyclohexane
Furan
(Cyclohexane)
8. Which of the following does not contain fused benzene rings?
Naphthalene
Anthracene
Diphenyl
β-Naphthol
(Diphenyl)
9. A compound with molecular formula C6H4O has all the four carbon atoms and the oxygen atom in the ring. It also has two double bonds. The compound is
Homocyclic and aromatic
Heterocyclic and aromatic
Homocyclic but not aromatic
Heterocyclic but not aromatic
(Heterocyclic and aromatic)
10. Which of the following is heterocyclic aromatic species?
—
—
—
—
()
11. The structural formula of cyclohexyl alcohol is
—OH attached to cyclohexane ring
—CH2OH attached to cyclohexane ring
CH2OH linear chain
Other
(—OH attached to cyclohexane ring)
12. Vinyl carbinol is
HO–CH2–CH=CH2
CH2–CH(OH)=CH2
CH2–CH=CH–OH
CH3–C(CH2OH)=CH2
(HO–CH2–CH=CH2)
13. Aromatic character of benzene is proved by
Resonance theory
Aromatic sextet theory
Orbital theory
All the above
(All the above)
14. The hetero atoms present in the given compound NH2–…
2
3
1
0
(2)
15. Which of the following is a heterocyclic compound?
— Structure with O
— Structure with N
— Structure with S
All of the above
(All of the above)
16. Which of the following is an aromatic compound?
Furan
Anthracene
Pyridine
All are aromatic
(All are aromatic)
17. Which of the following is an aromatic heterocyclic compound?
Furan
Pyrrole
Pyridine
All
(All)
18. Which of the following is not a carbocyclic compound?
Cyclopentane
Naphthalene
Thiophene
Benzene
(Thiophene)
19. Which of the following is heterocyclic aromatic species?
Pyridine
Furan
Thiophene
All
(All)
20. The structure representing a heterocyclic compound is
CH2–CH2–COOH
CH2–CO–O–CH2
CH=CH–O–CH=CH
O=CH–CH=CH
(CH=CH–O–CH=CH)
21. The lowest alkane which has ethyl group as substituent has IUPAC name
2-Ethylpropane
2-Ethylbutane
3-Ethylpentane
None of these
(b)
22. IUPAC name of methyl carbinol is
Methanol
Ethanol
Propanol
Butanol
(b)
23. The correct TUPAC name of C₆H₅COCl is
Benzene carbonyl chloride
Benzoyl chloride
Chlorophenyl ketone
Phenyl chloride ketone
(b)
24. IUPAC name of CH₂=CH-CH₂-Cl is
Allyl chloride
1-Chloro-3-propene
3-Chloro-1-propene
Vinyl chloride
(a)
25. The IUPAC name of given compound CHO-COOH is
Oxalic acid
Formyl methanoic acid
2-oxoethanoic acid
Both (b) and (c)
(d)
26. The IUPAC name of the compound CH₃-CO-O-CO-CH₃ is
Ethanoic acid anhydride
Acetic anhydride
Diethanoic anhydride
Ethanoic anhydride
(b)
27. The IUPAC name of the given compound CH₂-CN | CH-CN | CH₂-CN is
1.2.3-Tricarbonitrile propane
Propane-1.1.1-tricarbylamine
Propane-1,2,3-tricarbonitrile
3-Cyano pentane dinitrile
(c)
28. The correct IUPAC name of CH₃CH₂CONHCH₃ is
N-Ethylethanamide
N-Methylethanamide
N-Methylpropanamide
N-Ethylmethanamid
(b)
29. IUPAC name of D.D.T. is
Dichlorodiphenyl trichloro ethane
Dichlorodiphenyl trichloro benzene
Dichlorodiphenyl trichloro propane
1,1,1-Trichloro 2,2 bis (p-chlorophenyl) ethane
(d)
30. The formula of Freon-12 is
CCl₂F₂
CH₂Cl₂
CH₂F₂
CClF₂
(a)
31. IUPAC name of mesitylene is
1,2,3-Trimethylbenzene
1,3,5-Trimethylbenzene
1,2,4-Trimethylbenzene
1,4-Dimethylbenzene
(b)
32. Which of the following groups is always taken as a substituent in the nomenclature?
–NH₂
–CN
–CHO
–NO₂
(c)
33. Conjugated double bond is present in:
Buta-1,2-diene
Buta-1,3-diene
Penta-1,2-diene
β-butylene
(b)
34. The IUPAC name of CH₃-CH₂-NH-CH₃ is:
Methyl ethyl amine
1-Methyl amino ethane
N-Methyl ethanamine
N-Ethyl methanamine
(c)
35. H-CO-CN in IUPAC is called:
Cyano methanal
2-oxo ethanenitrile
Cyano ethanal
Formonitrile
(a)
36. The IUPAC name for isobutyl group is
2-Methylethyl
1,1-Dimethylethyl
2-Methylpropyl
1-Methylpropy
(c)
37. The IUPAC name of tert-butyl group is
2-Methyl propyl
2-Methyl ethyl
1,1-Dimethyl ethyl
2-Methyl-2-propyl
(c)
38. Systematic name of urea (NH₂CONH₂) is
Diaminoketone
1-Aminoethanamide
1-Aminomethanamide
Aminoacetamide
(c)
39. 3-Phenylprop-2-enoic acid is IUPAC name of
Mendallic acid
Pyruvic acid
Succinic acid
Cinnamic acid
(d)
40. The correct IUPAC name of CH₃-CHCl-CO-Cl is
1,2-dichloropropanone
2-Chloropropanoyl chloride
1,2-dichloropropanal
Chloroformyl chloroethane
(b)
41. The correct IUPAC name of CH₃-CH₂-CO-OCH₃ is
Methoxy propanone
Methoxy propanal
Methyl propanoate
Methyl ethanoate
(c)
42. The correct IUPAC name of CH₃-C(C₂H₅)=C(C₂H₅)-CH₃ is
1,2-Diethylbutane
2-Ethyl-3-methylpentane
3,4-Dimethylhex-3-ene
None is correct
(a)
43. One among the following is the correct IUPAC name for the compound CH₃-CH₂-NH-CHO
N-Formylaminoethane
N-Ethylformylamine
N-Ethylmethanamid
Ethylaminomethanal
(b)
44. Which among the following is the correct IUPAC name of isoamylene?
1-Pentene
2-Methylbut-2-ene
3-Methylbut-1-ene
2-Methylbut-1-ene
(b)
45. The common name of (CH₃)₃CC₂H₅ is
Isohexane
Neohexane
Trimethylpropane
None is correct
(b)
46. The family to which methoxyethene belongs is
Hydrocarbon
Ketone
Unsaturated ether
Ester
(c)
47. The correct IUPAC name of acetonitrile is
Cyanomethane
2-Ketopropanenitrile
Methanenitrile
Ethanenitrile
(a)
48. The correct IUPAC name of CH₃CH₂CH(CH₃)CH(C₂H₅)₂ is
4-Ethyl-3-methylhexane
3-Ethyl-4-methylhexane
3-Methyl-4-ethylhexane
2-Isopentylbutane
(b)
49. The correct IUPAC name of CH₃-CO-OCOCH₃ is
Methyl ethanoate
Aceto ethanoate
Ethanoic anhydride
Ethanoyl ethanoate
(c)
50. The correct IUPAC name of HOOC-CH(COOH)-COOH is
Tricarboxymethane
Propanetrioic acid
Tribuutanoic acid
Methanetricarboxylic acid
(d)
51. The IUPAC name of CH₃OCH₂CH₂CH₂OCH₂CH₃ is
3-Ethoxy-1-methoxypropane
Ethoxy propaneoxymethane
1-Ethoxy-3-methoxypropane
2,5-Dioxyhexane
(c)
52. IUPAC name of (CH₂=CH)₂CH-CH=CH₂ is
3,3-Divinyl-1-propene
Triethenylmethane
Trivinylethane
3-Vinylpenta-1,4-diene
(d)
53. IUPAC name of CH₃CH(OH)COOH is
Lactic acid
α-Hydroxypropionic acid
Carboxypropanol
2-Hydroxypropanoic acid
(d)
54. A student named the compound as 1,4-butadiene — The name is correct or error?
The name is correct
He committed an error in the selection of carbon chain
He committed an error in position of double bond
Unpredictable
(a)
55. Which of the following structures represents 2,2,3-trimethylhexane?
CH₃C(CH₃)₂CH₂CH(CH₃)₂
CH₃CH(CH₃)CH₂CH(CH₃)CH₂CH₃
CH₃C(CH₃)₂CH(CH₃)CH₂CH₂CH₃
CH₃C(CH₃)₂CH₂C(CH₃)₂CH₃
(c)
56. The correct IUPAC name of (C₂H₅)₄C is
Tetraethyl methane
2-Ethylpentane
3,3-Diethylpentane
None of the above
(d)
57. The IUPAC name of the compound CH₃CONH(Br) is
1-Bromoacetamide
N-Bromoethanemide
Ethanoyl bromide
None of these
(a)
58. The structure of 4-methylpent-2-en-1-ol is
CH₃-CH₂-CH=CH-CH₂OH
CH₃-CH(CH₃)-CH=CH-CH₂OH
CH₃-CH(OH)-CH₂-CH=C(CH₃)-CH₃
CH₃-C(CH₃)=CH-CH₂CH₂OH
(b)
59. The IUPAC name of the hydrocarbon CH≡C-CH=CH-CH=CH₂ is
Hexa-3,5-dien-5-yne
Hexa-1,2-dien-1-yne
Hexa-1,3-dien-5-yne
Hexa-3,5-dien-1-yne
(c)
60. The IUPAC name of CH₃COCH(Cl)-CH(I)-COOH is
2-Iodo-3-chloro-4-oxopentanoic acid
4-Oxo-3-chloro-2-iodopentanoic acid
4-Carboxy-4,3-chloro-2-butanone
3-Chloro-2-iodo-4-oxopentanoic acid
(b)
61. The IUPAC name of CH₃C₂H₅-C(CH₂)-CH₂-CH(CH₃)-NH₂ is
4-Ethylpent-4-en-2-amine
2-Amino-4-ethylpent-4-ene
2-Ethylpentan-4-amine
4-Amino-2-ethylpent-1-ene
(c)
62. The IUPAC name of (C₂H₅)₂NCH₂CH(Cl)COOH is
2-Chloro-4-ethylpentanoic acid
2-Chloro-3-(N,N-diethylamino)propanoic acid
2-Chloro-2-oxodiethylamine
2-Chloro-2-carboxy-N-ethylethane
(b)
63. The IUPAC name of CH₃CH(C₆H₅)CH₂CH₃ is
2-Cyclohexylbutane
sec-Butylbenzene
3-Cyclohexylbutane
3-Phenylbutane
(d)
64. The IUPAC name of compound CH₂-COOH | C-(OH)(COOH) | CH₂-COOH is
1,2,3-Tricarboxy-2,1-propane
3-Carboxy-3-hydroxy-1.5-pentanedioic acid
3-Hydroxy-3-carboxy-1.5-pentanedioic acid
2-Hydroxypropane-1,2,3-tricarboxylic acid
(d)
65. The correct IUPAC name of H-CO-CO-COOH is
3-Aldo-2-oxopropanoic acid
2,3-Dioxopropanoic acid
1-Hydroxypropane-1,2,3-trione
2-Aldo-2-ketomethanoic acid
(b)
66. The common and IUPAC names for the group (CH₃)₂CHCH₂- respectively are
Isobutyl, 2-methylpropyl
Isobutyl, 1-methylpropyl
tert-Butyl, 1,1-dimethylethyl
sec-Butyl, 2-methylpropyl
(a)
67. The principal functional group in BrCH₂CH(OH)CH₂COCH₂NO₂ is
–Br
>C=O
–OH
–NO₂
(b)
68. The secondary suffix and the secondary prefix for the functional group –CO-Cl respectively are
Oyl chloride, chlorocarbonyl
Chlorocarbonyl, oyl chloride
Oyl chloride, yl chloride
yl chloride, oyl chloride
(a)
69. The correct decreasing order of priority for –CONH₂, –CN and –COOR is
–CONH₂, –COOR, –CN
–COOR, –CONH₂, –CN
–CN, –COOR, –CONH₂
–CN, –CONH₂, –COOR
(b)
70. The IUPAC name for the compound CH₃-CH₂-N(CH₂CH₃)-CH₂CH₃ is
Triethylamine
Ethyltriamine
N,N-Diethylethanamine
None of the above
(a)
71. The systematic name for HCON(CH₃)₂ is
N,N-Dimethylformamide
N,N-Dimethylaminomethanol
2,3-Dimethylbutene
1,2-Dimethylcyclobutane
(a)
72. The IUPAC name for CH₃-CH₂-CO-O-CO-CH₂-CH₃ is
Propionic anhydride
Dipropanoic anhydride
Ethoxypropanoic acid
Propanoic anhydride
(a)
73. The IUPAC name of (CH₃)₂CH-CH₂-CH₃Br is
1-Bromopentane
2-Methyl-4-bromopentane
1-Bromo-3-methylbutane
2-Methyl-3-bromopropane
(c)
74. The IUPAC name of (CH₃)₃C-CH=CH₂ is
2,2-Dimethylbut-2-ene
2,2-Dimethylpent-3-ene
3,3-Dimethylbut-1-ene
Hex-1-ene
(c)
75. What is the IUPAC name of H-CO-CH₂-CH₂-OCH₃?
2-Formylmethoxyethane
Methoxypropanal
2-Methoxypropanal
3-Methoxypropanal
(b)
76. The IUPAC name of CH₃-C(Cl)=C(CH₃)-CH(C₂H₅)-CH₂-C≡CH is
6-Chloro-4-ethyl-5-methylhept-5-en-1-yne
6-Chloro-4-ethyl-5-methylhept-1-yn-5-ene
2-Chloro-4-ethyl-3-methylhept-2-en-6-yne
2-Chloro-4-ethyl-3-methylhept-6-yn-2-ene
(b)
77. TUPAC name of CH₃-CH(C₂H₅)-C(C₄H₉)(CH₃)-CH₃ is
2-Butyl-2-methyl-3-ethylbutane
2-Ethyl-3,3-dimethylheptane
3,4,4-Trimethylheptane
3,4,4-Trimethyloctane
(b)
78. The IUPAC name of CH₃-C(CH₃)=CH-COOH is
2-Methylbut-2-enoic acid
3-Methylbut-3-enoic acid
3-Methylbut-2-enoic acid
2-Methylbut-3-enoic acid
(a)
79. The IUPAC name of CH(CHO)=CH(NH₂) is
1-Aminoprop-2-enal
3-Aminoprop-2-enal
1-Amino-2-formylethene
3-Amino-1-oxoprop-2-ene
(a)
80. The TUPAC name of CH₃-CH(OH)-CH=C(CH₃)-CHO is
4-Hydroxy-1-methylpentanal
4-Hydroxy-2-methylpent-2-en-1-al
2-Hydroxy-4-methylpent-3-en-5-al
2-Hydroxy-3-methylpent-2-en-5-a
(b)
81. The IUPAC name of CH₃-CH(CH₃)-C(CH₂)-CH₂-CH₃ is
2-Ethyl-3-methylbut-1-ene
2-Isopropylbut-1-ene
2-Methyl-3-ethyl-3-butene
2-(1-Methylethyl)but-1-ene
(d)
82. The IUPAC name of CH₃-CH(CH(CH₃)₂)-CH₂CH₂CH₃ is
2-Isopropyl pentane
2,3-Dimethylhexane
Isononane
2,4-Dimethylhexane
(b)
83. The TUPAC name of CH₃-C≡C-CH(CH₃)₂ is
4-Methyl-pent-2-yne
4,4-Dimethyl-but-2-yne
Isopropylmethylacetylene
2-Methylpent-2-yne
(a)
84. The IUPAC name of CH₃CH=CHCH₂CH(NH₂)CH₂COOH is
5-Aminohept-2-enoic acid
β-Amino-δ-heptanoic acid
5-Aminohex-2-enecarboxylic acid
2-Amino-5-hexenoic acid
(c)
ISOMERISM
1. Isomers of propionic acid are
HCOO–C₃H₅ and CH₃COOCH₃
HCOO–C₂H₅ and C₃H₇COOH
CH₃COOCH₃ and C₃H₇OH
C₃H₇OH and CH₃COCH₃
(b)
2. Ethoxyethane and methoxypropane are
Geometrical isomers
Optical isomers
Metamers
Functional isomers
(c)
3. An isomer of ethanol is
[MOE 2009, IOM 2010]
Methanol
Dimethyl ether
Diethyl ether
Ethylene glycol
(b)
4. Dimethyl ether and ethyl alcohol are
Chain isomers
Position isomers
Functional isomers
Metamers
(c)
5. 2-Pentene and 1-pentene are isomers
Chain
Position
Functional
Geometrical
(b)
6. Number of isomeric forms of C₆H₅N having benzene ring will be
7
6
5
4
(b)
7. Which of the following will show metamerism?
CH₃COC₃H₇
CH₃–S–C₂H₅
CH₃OCH₃
CH₃OC₂H₅
(d)
8. How many structural formula are possible for C₅H₁₁Cl?
6
8
10
12
(c)
9. The number of isomers for the aromatic compounds of the formula C₇H₈O is
2
3
4
5
(c)
10. How many isomers of C₅H₁₁OH will be primary alcohols?
2
3
4
5
(c)
11. The number of ether metamers represented by the formula C₄H₁₀O is
4
3
2
1
(b)
12. The number of possible alcoholic isomers for C₄H₁₀O are
4
2
3
5
(a)
13. The total number of structural isomers for the compounds of the formula C₄H₁₀ are
7
6
3
4
(c)
14. How many geminal dihalides with different formula are possible for C₃HCl₃?
Only one
Two
Three
Four
(b)
15. The enolic form of acetone contains
9σ-bonds, 1π-bond and 2 lone pairs
8σ-bonds, 2π-bonds and 2 lone pairs
10σ-bonds, 1π-bond and 1 lone pair
9σ-bonds, 2π-bonds and 1 lone pair
(d)
16. In what respect propene and 2-butene are similar?
They are position isomers of each other
They have different chemical properties
They are homologous of each other
None of the statement is correct
(d)
17. The compounds (CH₃)₃N & CH₃CH₂CH₂NH₂ represent
Chain isomerism
Position isomerism
Functional isomerism
All of the above
(c)
18. Which of the following compound will show tautomerism?
R₃CNO₂
(CH₃)₃CNO
(CH₃)₂NH
RCH₂CHO
(d)
19. In the keto-enol tautomerism of dicarbonyl compounds, the enol form is preferred in contrast to the keto form, this is due to
Presence of carbonyl group on each side of the -CH₂
Resonance stabilization of the enol form
Presence of methylene group
Rapid chemical exchange
(b)
20. Glucose and fructose are
Chain isomers
Position isomers
Functional isomers
Optical isomers
(c)
21. Number of isomeric primary amines of molecular formula C₄H₁₁N is
1
2
3
4
(c)
22. The type of isomerism observed in urea molecule is
Chain
Position
Geometrical
Tautomerism
(d)
23. The least number of carbon atoms in alkane forming conformational isomers is
1
2
3
4
(b)
24. The least number of carbon atoms in alkane forming structural isomers is
1
2
3
4
(d)
25. The property by which a substance has the same molecular formula but different structure is
Isomorphism
Polymorphism
Isomerism
Allotropism
(c)
26. The number of dichlorinated isomers that can be formed by halogenations of CH₃CH₂CH₃ is
2
3
5
4
(b)
27. 1-Bromobutane and 2-Bromobutane are .... isomers
Functional
Positional
Chain
Optical
(b)
28. The compound n-butyl alcohol and isobutyl alcohol are
Position isomers
Chain isomers
Metamers
Tautomers
(b)
29. n-Propyl alcohol and isopropyl alcohols are examples of
Position isomerism
Chain isomerism
Tautomerism
Geometrical isomerism
(a)
30. The number of isomeric aldehydes and ketones with formula C₅H₁₀O are
7
6
5
8
(a)
31. Tautomerism is also called
Desmotropism
Allelotropism
Kryptotropism
All of the above
(d)
32. The type of isomerism shown by nitromethane is
Metamerism
Optical isomerism
Tautomerism
Position isomerism
(c)
33. Which of the following class of compounds cannot show metamerism?
Ethers
Ketones
Amines
Nitriles
(d)
34. HCN and HNC are
Tautomers
Positional isomers
Metamers
Chain isomers
(b)
35. Cyanides and isocyanides are isomers of the type
Position isomers
Tautomer
Functional isomers
None of these
(c)
36. The total number of possible isomeric trimethylbenzene is
2
3
4
6
(b)
37. The molecular formula of diphenylmethane. How many structural isomers are possible when one of the hydrogen atom is replaced by a chlorine atom?
6
4
8
7
(d)
38. Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds is
n-Hexane
2,3-Dimethylbutane
2,2-Dimethylbutane
2-Methylpentane
(d)
39. Only two isomeric monochloro derivatives are possible for
n-Butane
2,4-Dimethylpentane
Benzene
Neopentane
(a)
40. The total number of isomeric carbocations possible for the formula C₄H₉⁺ is
3
4
2
5
(a)
41. Including cyclic structures, how many structural isomers are possible for the formula C₄H₈?
3
5
2
4
(b)
42. The total number of structural isomers possible for structure C₃H₆ are
1
2
3
4
(c)
43. The compound n-butyl alcohol and isobutyl alcohol are
Position isomers
Chain isomers
Metamers
Tautomers
(b)
44. One among the following pairs of compounds is not a pair of isomers
(CH₃)₂CHOC₂H₅; CH₃[CH₂]₂OC₂H₅
CH₃CH₂CO₂H; CH₃COOCH₃
(CH₃)₂CHCH₂CH₃; CH₃CH₂CH(CH₃)₂
CH₃CH₂NO₂; CH₂(NH₂)COOH
(d)
45. The number of isomeric aldehydes and ketones with formula C₅H₁₀O are
7
6
5
8
(a)
46. Which of the following is not an isomer of butanal?
2-Butanone
2-Methylpropanal
2-Butanol
But-2-en-1-ol
(c)
47. Monocarboxylic acids are isomeric with
Aldehydes
Ketones
Esters
Alcohols
(b)
48. Which of the following is not an isomer of CH₃CH₂CH₂CH₂OH?
CH₃CH(CHO)CH₃
(CH₃CH₂)₂O
CH₃OCH₂CH₂CH₃
CH₃CH(OH)CH₂CH₃
(a)
49. Which of the following isomerism is shown by ethyl acetoacetate?
Enantiomerism
Keto-enol isomerism
Geometrical isomerism
Diastereoisomerism
(b)
50. Which of the following statement is incorrect?
Homologues cannot be isomers but isomers can be homologues
Isomers cannot be homologues
The number of paired and unpaired electrons in various resonating forms is equal
Tautomers differ in atomic as well as electronic arrangements
(b)
51. Which of the following contains secondary butyl and tertiary butyl group?
CH₃CH₂CH₂CH₂-C(CH₃)(CH₃)-CH₃
(CH₃)₂-CH-C(CH₃)₂-CH₃
CH₃-CH(C₂H₅)-C(CH₃)₃
C₆H₅-CH₂-C(CH₃)₃
(b)
Additional questions
1. Geometrical Isomerism is exhibited by
> C=C<
> C=N-
-N=N-
All of the above
(d)
2. Which of the following will show geometrical isomerism?
1-Butene
1,2-Dibromobut-1-ene
Propene
Isopropylene
(b)
3. Which among the following is likely to show geometrical isomerism?
CH₃CH=CH₂
CH₃CH=N–OH
CH₃C(Cl)=C(CH₃)₂
CH₂=CH–CH=CCl₂
(c)
4. One among the following will not show geometrical isomerism
()
5. Geometrical isomerism is caused by
Different groups attached to the same functional group
Swing of H atoms between two polyvalent atoms
Presence of an asymmetric carbon atom
Restricted rotation about C=C
(d)
6. The lowest alkene which can exhibit geometrical isomerism is
Ethene
Propene
1-Butene
2-Butene
(d)
7. Geometrical isomerism is possible in
Acetone-oxime
Isobutene
Acetophenone-oxime
Benzophenone-oxime
(c)
8. Which of the following compounds exhibit geometrical isomerism?
2-Methyl-1-pentene
2-Methyl-2-pentene
2-Hexene
2,3-Dimethyl-2-butene
(c)
9. Which of the following exhibit geometrical isomerism?
CH₂=CBrI
CH₃CH=CBrI
CH₃CH=CCl₂
(CH₃)₂C=CCIBr
(d)
10. Optical activity is measured by
[IOM 2007]
Polarimeter
Photometer
Optometry
Bolometer
(a)
11. Which is the chiral molecule?
CH₃Cl
CH₂Cl₂
CHBr₃
CHBrCl
(d)
12. Which of the following will show optical isomerism?
3,3-Dichloropentane
2-Chloro-2-butanol
2-Chloro-2-propanol
All of the above
(b)
13. How many optically active stereoisomers are possible for butane-2,3-diol?
[I.E.]
1
2
3
4
(d)
14. Which of the following compounds exhibits stereoisomerism?
2-Methylbut-1-ene
3-Methylbut-3-yne
3-Methylbutanoic acid
2-Methylbutanoic acid
(a)
15. Which shows chirality?
[I.E. 2011]
2-Methylhexane
3-Methylhexane
n-Hexane
None of these
(b)
16. The property by virtue of which a compound can turn the plane polarised light is known as
Photolysis
Phosphorescence
Optical activity
Polarization
(c)
17. Rotation of plane polarised light can be measured by
Manometer
Galvanometer
Polarimeter
Viscometer
(c)
18. Which can exist in optically active form?
1-Butanol
2-Butanol
3-Pentanol
4-Heptanol
(b)
19. The lowest alkene which is capable of exhibiting enantiomerism must have
5 C atoms
6 C atoms
7 C atoms
4 C atoms
(a)
20. The instrument which can be used to measure optical activity i.e., specific rotation is
Photometer
Lactometer
Polarimeter
Refractometer
(c)
21. Which of the following compound could be optically active?
4-Chloro-1-butanol
Tertiary butyl alcohol
Secondary butyl amine
n-Butyl alcohol
(a)
22. Racemic mixture is optically inactive due to
Presence of plane of symmetry
External compensation
Internal compensation
None of these
(c)
23. How many chiral carbons are present in glucose molecule CHO(CHOH)₄CH₂OH?
4
3
2
1
(a)
24. The process of converting D-form to L-form or vice versa is known as
Walden inversion
Resolution
Racemisation
None
(c)
25. Which of the following compounds exhibit enantiomerism?
3-Hydroxypropanoic acid
3-Hydroxybutanoic acid
4-Hydroxybutanoic acid
None of these
(b)
26. Which one of the following compounds will not exhibit optical isomerism?
