MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers

Students may want to download NCERT MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers Pdf free download. These Haloalkanes and Haloarenes Class 12 MCQs Questions with Answers can help understand the concepts score better in your Class 12 Chemistry Exam, so make sure you practice these! Check out chapter-wise MCQ Questions for Class 12 Chemistry with Answers.

Haloalkanes and Haloarenes Class 12 MCQs Questions with Answers

Solve these Haloalkanes and Haloarenes Multiple Choice Questions of Class 12 Chemistry Chapter 10 MCQ, so as not to miss out on any concept from being clear about what they mean!

Question 1.
The order of reactivity of the following alcohols with halogen acids is
(a) CH3CH2-CH2-OH
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 1
(a) (a) > (b) > (c)
(b) (c) > (b) > (a)
(c) (b) > (a) > (c)
(d) (a) > (c) > (b)

Answer

Answer: (b) (c) > (b) > (a)


Question 2.
Which of the following alcohols will yield the corresponding alkyl chloride on reaction with concentrated HCI at room temperature?
(a) CH3CH2-CH2-OH
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 2

Answer

Answer:
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 3


Question 3.
Identify the compound Y in the following reaction.
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 4

Answer

Answer:
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 5


Question 4.
Toluene reacts with a halogen in the presence of iron (iii) chloride giving ortho and para halo compounds. The reaction is
(a) Electrophilic elimination reaction
(b) Electrophilic substitution reaction
(c) Free radical addition reaction
(d) Nucleophilic substitution reaction

Answer

Answer: (b) Electrophilic substitution reaction


Question 5.
Which of the following is halogen exchange reaction?
(a) RX + Nal → Rl + NaX
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 6

Answer

Answer: (a) RX + Nal → Rl + NaX


Question 6.
Which reagent will you use for the following reaction?
CH3CH2CH2CH3 →CH3CH2CH2CH2Cl + CH3CH2CHClCH3
(a) Cl2/UV light
(b) NaCl + H2SO4
(c) Cl2 gas in dark
(d) Cl2 gas in the presence of iron in dark

Answer

Answer: (a) Cl2/UV light


Question 7.
Arrange the following compounds in the increasing order of their densities.
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 7
(a) (i) < (ii) < (iii) < (iv)
(b) (i) < (iii) < (iv) < (ii)
(c) (iv) < (iii) < (ii) < (i)
(d) (ii) < (iv) < (iii) < (i)

Answer

Answer: (a) (i) < (ii) < (iii) < (iv)


Question 8.
Arrange the following compounds in increasing order of their boiling points.
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 8
(a) (ii) < (i) < (iii)
(b) (i) < (ii) < (iii)
(c) (iii) < (i) < (ii)
(d) (iii) < (ii) < (i)

Answer

Answer: (c) (iii) < (i) < (ii)


Question 9.
In which of the following molecules carbon atom marked with asterisk (*) is asymmetric?
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 9
(a) (i), (ii), (iii), (iv)
(b) (i), (iii), (iii)
(c) (ii), (iii), (iv)
(d) (i), (iii), (iv)

Answer

Answer: (b) (i), (iii), (iii)


Question 10.
Which of the following structures is enantiomeric with the molecule (A) given below?
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 10

Answer

Answer:
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 11


Question 11.
Which of the following is an example of vic-dihalide?
(a) Dichloromethane
(b) 1,2-dichloroethane
(c) Ethylidene chloride
(d) Ally l chloride

Answer

Answer: (b) 1,2-dichloroethane


Question 12.
The position of -Br in the compound in CH3CH=CHC(Br)(CH3)2 can be classified as
(a) Allyl
(b) Aryl
(c) Vinyl
(d) Secondary

Answer

Answer: (a) Allyl


Question 13.
Chlorobenzene is formed by reaction of chlorine with benzene in the presence of AlCl3. Which of the following species attacks the benzene ring in this reaction?
(a) cl
(b) cl+
(c) AlCl3
(d) [AlCl4]

Answer

Answer: (b) cl+


Question 14.
Ethylidene chloride is a/an
(a) vic-dihalide
(b) gem-dihalide
(c) allylic halide
(d) vinylic halide

Answer

Answer: (b) gem-dihalide


Question 15.
What is ‘A’ in the following reaction?
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 12

Answer

Answer:
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 13


Question 16.
A primary alkyl halide would prefer to undergo
(a) SN1 reaction
(b) SN2 reaction
(c) α-Elimination
(d) Racemisation

Answer

Answer: (b) SN2 reaction


Question 17.
Which of the following alkyl halides will undergo SN1 reaction most readily?
(a) (CH3)3C-F
(b) (CH3)3C-Cl
(c) (CH3)3C-Br
(d) (CH3)3C-I

Answer

Answer: (d) (CH3)3C-I


Question 18.
Which is the correct IUPAC name for
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 14
(a) 1-Bromo-2-ethylpropane
(b) 1 -Bromo-2-ethyl-2-methylethane
(c) 1-Bromo-2-methylbutane
(d) 2-Methyl-1-bromobutane

Answer

Answer: (c) 1-Bromo-2-methylbutane


Question 19.
What should be the correct IUPAC name for diethylbromomethane?
(a) 1-Bromo-1,1-diethylmethane
(b) 3-Bromopentane
(c) 1-Bromo-1-ethylpropane
(d) 1-Bromopentane

Answer

Answer: (b) 3-Bromopentane


Question 20.
The reaction of toluene with chlorine in the presence of iron and in the absence of light yields
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 15
(d) Mixture of (b) and (c)

Answer

Answer: (d) Mixture of (b) and (c)


Question 21.
Chloromethane on treatment with excess of ammonia yields mainly
(a) N, N-Dimethylmethanamine
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 16
(b) N-methylmethanamine (CH3-NH-CH3)
(c) Methanamine (CH3NH2)
(d) Mixture containing all these in equal proportion

Answer

Answer: (c) Methanamine (CH3NH2)


Question 22.
Molecules whose mirror image is non- superimposable over them are known as chiral. Which of the following molecules is chiral in nature?
(a) 2-Bromobutane
(b) 1 -Bromobutane
(c) 2-Bromopropane
(d) 2-Bromopropan-2-ol

Answer

Answer: (a) 2-Bromobutane


Question 23.
Reaction of C6H5CH2Br with aqueous sodium hydroxide follows
(a) SN1 mechanism
(b) SN2 mechanism
(c) Any of the above two depending upon the temperature of reaction
(d) Saytzeff rule

Answer

Answer: (a) SN1 mechanism


Question 24.
Which of the carbon atoms present in the molecule given below are asymmetric?
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 17
(a) a, b, c, d
(b) b, c
(c) a, d
(d) a, b, c

Answer

Answer: (b) b, c


Question 25.
The IUPAC name of the compound shown below is:
MCQ Questions for Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes with Answers 18
(a) 2-bromo-6-chlorocyclohex-1 -ene
(b) 6-bromo-2-chlorocyclohexene
(c) 3-bromo-1-chlorocyclohexene
(d) 1 -bromo-3-chlorocyclohexene

Answer

Answer: (c) 3-bromo-1-chlorocyclohexene


Assertion and Reason Type Questions

The questions given below consist of an assertion and a reason. Use the following key to choose the appropriate answer.
(a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).
(b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).
(c) Assertion (A) is correct, Reason (R) is wrong statement.
(d) Assertion (A) is wrong, but Reason (R) is correct statement.

Question 26.
Assertion: Addition of Br2 to but-1-ene gives two optical isomers.
Reason: The product contains one asymmetric carbon atom.

Answer

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).


Question 27.
Assertion: SN2 reaction proceeds with inversion of configuration.
Reason: SN2 reactions occur in one step.

Answer

Answer: (b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).


Question 28.
Assertion: Addition of Br2 to trans-2- butene yields meso-2, 3-dibromobutane.
Reason: Bromine addition to an alkene is an electrophilic addition reaction.

Answer

Answer: (b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).


Question 29.
Assertion: Benzyl bromide when kept in acetone-water, it produces benzyl alcohol.
Reason: The reaction follows SN2 mechanism.

Answer

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.


Question 30.
Assertion: The nucleophilic substitution of vinyl chloride is difficult than ethyl chloride.
Reason: Vinyl group is electron donating group.

Answer

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.


Question 31.
Assertion: tert-butyl bromide undergoes SN1 nucleophilic substitution readily than n-butyl bromide.
Reason: It proceeds by the formation of stable carbocation.

Answer

Answer: (a) Both Assertion (A) and Reason (R) are correct statements, and Reason (R) is the correct explanation of the Assertion (A).


Question 32.
Assertion: Ethanol gives iodoform test while methanol does not.
Reason: Ethanol is less reactive than methanol towards nucleophilic addition reactions.

Answer

Answer: (b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).


Question 33.
Assertion: Treatment of chloroethane with a saturated solution of AgCN gives ethyl isocyanide as the major product.
Reason: Cyanide ion (:CN ) is an ambident nucleophile.

Answer

Answer: (b) Both Assertion (A) and Reason (R) are correct statements, but Reason (R) is not the correct explanation of the Assertion (A).


Question 34.
Assertion: 2-Bromobutane on reaction with sodium ethoxide in ethanol gives 1-butene as the major product.
Reason: 1-Butene is less stable than 2-butene.

Answer

Answer: (d) Assertion (A) is wrong, but Reason (R) is correct statement.


Question 35.
Assertion: Alkyl iodide can be prepared by treating alkyl chloride/bromide with Nal in acetone.
Reason: NaCl and NaBr are soluble in acetone but Nal is not.

Answer

Answer: (c) Assertion (A) is correct, Reason (R) is wrong statement.


Question 36.
Assertion: Aryl halides undergo nucleophilic substitution reactions with ease.
Reason: The carbon halogen bond in aryl halides has partial double bond character.

Answer

Answer: (d) Assertion (A) is wrong, but Reason (R) is correct statement.


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