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Haloalkanes and Haloarenes Practice Questions - DPP for NEET

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PART-I (Single Correct MCQs)
1. Reaction of trans 2-phenyl-1-bromocyclopentane on reaction with
alcoholic KOH produces
(a) 1-phenylcyclopentene
(b) 3-phenylcyclopentene
(c) 4-phenylcyclopentene
(d) 2-phenylcyclopentene
2. The structure of the major product formed in the following
reaction
   is
Page 2


PART-I (Single Correct MCQs)
1. Reaction of trans 2-phenyl-1-bromocyclopentane on reaction with
alcoholic KOH produces
(a) 1-phenylcyclopentene
(b) 3-phenylcyclopentene
(c) 4-phenylcyclopentene
(d) 2-phenylcyclopentene
2. The structure of the major product formed in the following
reaction
   is
(a)
(b)
(c)
(d)
3. Which of the following will have a mesoisomer?
(a) 2, 3- Dichloropentane
(b) 2, 3-Dichlorobutane
(c) 2-Chlorobutane
(d) 2-Hydroxypropanoic acid
4. o-Methoxybromobenzene is treated with sodamide and then with
ammonia. The product formed is
(a) o-Methoxyaniline
(b) Aniline
(c) Methoxybenzene
(d) m-Methoxyaniline
5. Which of the following statements is wrong?
(a) Ethyl chloride on reduction with Zn-Cu couple and alcohol gives ethane.
Page 3


PART-I (Single Correct MCQs)
1. Reaction of trans 2-phenyl-1-bromocyclopentane on reaction with
alcoholic KOH produces
(a) 1-phenylcyclopentene
(b) 3-phenylcyclopentene
(c) 4-phenylcyclopentene
(d) 2-phenylcyclopentene
2. The structure of the major product formed in the following
reaction
   is
(a)
(b)
(c)
(d)
3. Which of the following will have a mesoisomer?
(a) 2, 3- Dichloropentane
(b) 2, 3-Dichlorobutane
(c) 2-Chlorobutane
(d) 2-Hydroxypropanoic acid
4. o-Methoxybromobenzene is treated with sodamide and then with
ammonia. The product formed is
(a) o-Methoxyaniline
(b) Aniline
(c) Methoxybenzene
(d) m-Methoxyaniline
5. Which of the following statements is wrong?
(a) Ethyl chloride on reduction with Zn-Cu couple and alcohol gives ethane.
(b) The reaction of methyl magnesium bromide with acetone gives butanol-
2.
(c) Alkyl halides follow the following reactivity sequence on reaction with
alkenes.
R – I > R – Br > R – Cl > R – I
(d) C
2
H
4
Cl
2
 may exist in two isomeric forms
6. An organic compound A (C
4
H
9
Cl) on reaction withNa/diethyl ether
gives a hydrocarbon which on monochlorination gives only one chloro
derivative, then  A is
(a) tert-butyl chloride
(b) sec-butyl chloride
(c) isobutyl chloride
(d) n-butyl chloride
7. The reaction of toluene with in presence of  gives and
reaction in presence of light gives ‘Y’. Thus, ‘X’ and ‘Y’ are :
(a) X = Benzal chloride, Y = o – Chlorotoluene
(b) X = m – Chlorotoluene, Y = p –Chlorotoluene
(c) X = o –and p – Chlorotoluene,
Y = Trichloromethylbenzene
(d) X = Benzyl chloride, Y = m – Chlorotoluene
8. .  The decreasing order of the rate
of the above reaction with nucleophiles (Nu
–
) A to D
is
[Nu
–
 = (A) PhO
–
, (B) AcO
–
, (C) HO
–
, (D) CH
3
O
–
]
(a) A > B > C > D
(b) B > D > C > A
(c) D > C > A > B
(d) D > C > B > A
Page 4


PART-I (Single Correct MCQs)
1. Reaction of trans 2-phenyl-1-bromocyclopentane on reaction with
alcoholic KOH produces
(a) 1-phenylcyclopentene
(b) 3-phenylcyclopentene
(c) 4-phenylcyclopentene
(d) 2-phenylcyclopentene
2. The structure of the major product formed in the following
reaction
   is
(a)
(b)
(c)
(d)
3. Which of the following will have a mesoisomer?
(a) 2, 3- Dichloropentane
(b) 2, 3-Dichlorobutane
(c) 2-Chlorobutane
(d) 2-Hydroxypropanoic acid
4. o-Methoxybromobenzene is treated with sodamide and then with
ammonia. The product formed is
(a) o-Methoxyaniline
(b) Aniline
(c) Methoxybenzene
(d) m-Methoxyaniline
5. Which of the following statements is wrong?
(a) Ethyl chloride on reduction with Zn-Cu couple and alcohol gives ethane.
(b) The reaction of methyl magnesium bromide with acetone gives butanol-
2.
(c) Alkyl halides follow the following reactivity sequence on reaction with
alkenes.
R – I > R – Br > R – Cl > R – I
(d) C
2
H
4
Cl
2
 may exist in two isomeric forms
6. An organic compound A (C
4
H
9
Cl) on reaction withNa/diethyl ether
gives a hydrocarbon which on monochlorination gives only one chloro
derivative, then  A is
(a) tert-butyl chloride
(b) sec-butyl chloride
(c) isobutyl chloride
(d) n-butyl chloride
7. The reaction of toluene with in presence of  gives and
reaction in presence of light gives ‘Y’. Thus, ‘X’ and ‘Y’ are :
(a) X = Benzal chloride, Y = o – Chlorotoluene
(b) X = m – Chlorotoluene, Y = p –Chlorotoluene
(c) X = o –and p – Chlorotoluene,
Y = Trichloromethylbenzene
(d) X = Benzyl chloride, Y = m – Chlorotoluene
8. .  The decreasing order of the rate
of the above reaction with nucleophiles (Nu
–
) A to D
is
[Nu
–
 = (A) PhO
–
, (B) AcO
–
, (C) HO
–
, (D) CH
3
O
–
]
(a) A > B > C > D
(b) B > D > C > A
(c) D > C > A > B
(d) D > C > B > A
9. The Wurtz-Fittig reaction involves condensation of :
(a) two molecules of aryl halides.
(b) one molecule of each of aryl-halide and alkyl-halide.
(c) one molecule of each of aryl-halide and phenol.
(d) two molecules of aralkyl-halides.
10. The major organic compound formed by the reaction of1, 1, 1-
trichloroethane with silver powder is:
(a) Acetylene
(b) Ethene
(c) 2 - Butyne
(d) 2 - Butene
11. Which of the following pairs of compounds are enantiomers?
(a)
(b)
(c)
(d)
12. Iodoform can be prepared from all except :
(a) Ethyl methyl ketone
(b) Isopropyl alcohol
(c) 3-Methyl 2-butanone
(d) Isobutyl alcohol
13. The reagent(s) for the following conversion,
Page 5


PART-I (Single Correct MCQs)
1. Reaction of trans 2-phenyl-1-bromocyclopentane on reaction with
alcoholic KOH produces
(a) 1-phenylcyclopentene
(b) 3-phenylcyclopentene
(c) 4-phenylcyclopentene
(d) 2-phenylcyclopentene
2. The structure of the major product formed in the following
reaction
   is
(a)
(b)
(c)
(d)
3. Which of the following will have a mesoisomer?
(a) 2, 3- Dichloropentane
(b) 2, 3-Dichlorobutane
(c) 2-Chlorobutane
(d) 2-Hydroxypropanoic acid
4. o-Methoxybromobenzene is treated with sodamide and then with
ammonia. The product formed is
(a) o-Methoxyaniline
(b) Aniline
(c) Methoxybenzene
(d) m-Methoxyaniline
5. Which of the following statements is wrong?
(a) Ethyl chloride on reduction with Zn-Cu couple and alcohol gives ethane.
(b) The reaction of methyl magnesium bromide with acetone gives butanol-
2.
(c) Alkyl halides follow the following reactivity sequence on reaction with
alkenes.
R – I > R – Br > R – Cl > R – I
(d) C
2
H
4
Cl
2
 may exist in two isomeric forms
6. An organic compound A (C
4
H
9
Cl) on reaction withNa/diethyl ether
gives a hydrocarbon which on monochlorination gives only one chloro
derivative, then  A is
(a) tert-butyl chloride
(b) sec-butyl chloride
(c) isobutyl chloride
(d) n-butyl chloride
7. The reaction of toluene with in presence of  gives and
reaction in presence of light gives ‘Y’. Thus, ‘X’ and ‘Y’ are :
(a) X = Benzal chloride, Y = o – Chlorotoluene
(b) X = m – Chlorotoluene, Y = p –Chlorotoluene
(c) X = o –and p – Chlorotoluene,
Y = Trichloromethylbenzene
(d) X = Benzyl chloride, Y = m – Chlorotoluene
8. .  The decreasing order of the rate
of the above reaction with nucleophiles (Nu
–
) A to D
is
[Nu
–
 = (A) PhO
–
, (B) AcO
–
, (C) HO
–
, (D) CH
3
O
–
]
(a) A > B > C > D
(b) B > D > C > A
(c) D > C > A > B
(d) D > C > B > A
9. The Wurtz-Fittig reaction involves condensation of :
(a) two molecules of aryl halides.
(b) one molecule of each of aryl-halide and alkyl-halide.
(c) one molecule of each of aryl-halide and phenol.
(d) two molecules of aralkyl-halides.
10. The major organic compound formed by the reaction of1, 1, 1-
trichloroethane with silver powder is:
(a) Acetylene
(b) Ethene
(c) 2 - Butyne
(d) 2 - Butene
11. Which of the following pairs of compounds are enantiomers?
(a)
(b)
(c)
(d)
12. Iodoform can be prepared from all except :
(a) Ethyl methyl ketone
(b) Isopropyl alcohol
(c) 3-Methyl 2-butanone
(d) Isobutyl alcohol
13. The reagent(s) for the following conversion,
is/are
(a) alcoholic KOH
(b) alcoholic KOH followed by NaNH
2
(c) aqueous KOH followed by NaNH
2
(d) Zn/CH
3
OH
14. In a nucleophilic substitution reaction:
,
which one of the following undergoes complete inversion of configuration?
(a) (C
6
H
5
)
2
CH(Br)
(b) C
6
H
5
CH
2
Br
(c) C
6
H
5
CH(CH
3
)(Br)
(d) (C
6
H
5
)
2
C(CH
3
)(Br)
15. Chlorobenzene reacts with trichloro acetaldehyde in the presence of
H
2
SO
4
.
The major product formed is:
(a)
(b)
(c)
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FAQs on Haloalkanes and Haloarenes Practice Questions - DPP for NEET

1. What are haloalkanes and haloarenes?
Ans. Haloalkanes and haloarenes are organic compounds that contain halogen atoms (such as chlorine, bromine, or iodine) directly attached to carbon atoms. Haloalkanes have a halogen atom attached to an alkyl group, while haloarenes have a halogen atom attached to an aromatic ring.
2. What are the common methods for the preparation of haloalkanes?
Ans. Haloalkanes can be prepared by various methods, including the free-radical halogenation of alkanes, nucleophilic substitution reactions, and addition reactions. Some common methods include the reaction of alcohols with hydrogen halides, the reaction of alkenes with hydrogen halides, and the reaction of alkyl halides with metallic halides.
3. How are haloarenes synthesized?
Ans. Haloarenes can be synthesized through different methods. One common method is by the electrophilic aromatic substitution reaction, where an aromatic compound reacts with a halogenating reagent (such as chlorine or bromine) in the presence of a Lewis acid catalyst. Another method is by the Sandmeyer reaction, which involves the conversion of an aromatic amine to a haloarene using copper(I) halide.
4. What are the uses of haloalkanes and haloarenes?
Ans. Haloalkanes and haloarenes have various uses in industries and research. Some haloalkanes are used as solvents, refrigerants, and as intermediates in the synthesis of pharmaceuticals and agrochemicals. Haloarenes have applications in the production of dyes, pesticides, and pharmaceuticals. They are also used as intermediates in the synthesis of various organic compounds.
5. What are the environmental concerns associated with haloalkanes and haloarenes?
Ans. Haloalkanes and haloarenes are known to have environmental concerns. Some haloalkanes, such as chlorofluorocarbons (CFCs), contribute to ozone depletion in the Earth's atmosphere. They have been phased out due to their harmful effects on the ozone layer. Additionally, certain haloarenes are considered persistent organic pollutants (POPs) and can bioaccumulate in the environment, posing risks to ecosystems and human health.
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