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Haloalkanes and Haloarenes Class 12 MCQs Questions with Answers
Solving the Haloalkanes and Haloarenes Multiple Choice Questions of Class 12 Chemistry Chapter 10 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Haloalkanes and Haloarenes Class 12 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 10 Chemistry Class 12 and cross-check your answers during preparation.
Question 1.
The order of reactivity of the following alcohols with halogen acids is
(a) CH3CH2-CH2-OH
(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
Answer
Answer:
Question 3.
Identify the compound Y in the following reaction.
Answer
Answer:
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
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.
(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.
(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?
(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?
Answer
Answer:
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?
Answer
Answer:
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
(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
(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
(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?
(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:
(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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