Haloalkanes and Haloarenes MCQ Type Questions for ISC Class-12 Ch-10

Haloalkanes and Haloarenes MCQ Type Questions for ISC Class-12 Ch-10. These MCQ  / Objective Type Questions is based on latest reduced syllabus according 2021-22 session on bifurcated pattern. Visit official website CISCE for detail information about ISC Board Class-12 Chemistry.

 ISC Class-12 Ch-10 Haloalkanes and Haloarenes MCQ Type Questions 

Board ISC
Class  12th (XII)
Subject Chemistry
Chapter-10 Haloalkanes and Haloarenes
Syllabus  on bifurcated syllabus (after reduction)
Session 2021-22
Topic MCQ / Objective Type Question

 Haloalkanes and Haloarenes MCQ / Objective Type Questions for ISC Class-12 Ch-10

Question 1 : The hybridisation of carbon in diamond is

(a) sp3

(b) sp2

(c) sp

(d) dsp2

Answer: (a) sp3

Question 2 : Good conductor of electricity and heat is

(a) Anthracite coke

(b) Diamond

(c) Graphite

(d) Charcoal

Answer: (c) Graphite

Question 3: Gem-dibromide is

(a) CH3CH(Br)CH2(Br)

(b) CH3CBr2CH3

(c) CH2(Br)CH2CH2

(d) CH2BrCH2Br

Answer: (b) CH3CBr2CH3

Question 4: Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism?

(a) Benzyl Chloride

(b) Ethyl chloride

(c) Chlorobenzene

(d) Isopropyl chloride

Answer: (a) Benzyl Chloride

Question 5:  The increasing order of nucleophilicity would be?

(a) Cl < Br < I

(b) I < Cl < Br

(c) Br < Cl– < F

(d) I < Br < Cl

Answer: (a) Cl < Br < I

Question 6:  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:(b) Electrophilic substitution reaction

Question 7:  Which reagent will you use for the following reaction?

(a) Cl2/UV light

(b) NaCl + H2SO4

(c) Cl2 gas in dark

(d) Cl2 gas in the presence of iron in dark

Answer:(a) Cl2/UV light

Question 8: Which of the following is an example of vic-dihalide?

(a) Dichloromethane

(b) 1,2-dichloroethane

(c) Ethylidene chloride

(d) Ally l chloride

Answer:(b) 1,2-dichloroethane

Question 9: 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: (a) Allyl

Question 10:  In which of the following allotropes of carbon, percentage of carbon is maximum?

(a) Wood charcoal

(b) Coconut charcoal

(c) Graphite

(d) None of these

Answer: (c) Graphite

Question 11: IUPAC name of (CH3)3CCl

(a) 3-Chlorobutane

(b) 2-Chloro-2-methylpropane

(c) t-butyl chloride

(d) n-butyl chloride

Answer: (b) 2-Chloro-2-methylpropane

Question 12: Which of the following is a primary halide?

(a) Isopropyl iodide

(b) Secondary butyl iodide

(c) Tertiary butyl bromide

(d) Neohexyl chloride

Answer: (d) Neohexyl chloride

Question 13: Which of the following is most reactive towards SN1 reaction?

(a) C6H5C(CH3)C6H5Br

(b) C8H5CH2Br

(c) C6H5CH(C6H5)Br

(d) C6H5CH(CH3)Br

Answer: (a) C6H5C(CH3)C6H5Br

Question 14:  CH3CH2CH2Br + NaCN → CH3CH2CH2CN + NaBr, will be fastest in

(a) ethanol

(b) methanol

(c) N, N-dimethylformamide

(d) Water

Answer: (c) N, N-dimethylformamide

Question 15:  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: (b) cl+

Question 16: Ethylidene chloride is a/an

(a) vic-dihalide

(b) gem-dihalide

(c) allylic halide

(d) vinylic halide

Answer: (b) gem-dihalide

Question 17: A primary alkyl halide would prefer to undergo

(a) SN1 reaction

(b) SN2 reaction

(c) α-Elimination

(d) Racemisation

Answer: (b) SN2 reaction

Question 18: Organic compound must contain an element

(a) oxygen

(b) carbon

(c) hydrogen

(d) nitrogen

Answer: (b) carbon

Question 19: Alkene gives which of the following reactions?

(a) Addition reaction

(b) Substitution reaction

(c) Both (a) and (b)

(d) None of these

Answer:(c) Both (a) and (b)

Question 20: Single bond length between carbon-carbon is

(a) 1.34 Å

(b) 1.20 Å

(c) 1.54 Å

(d) none of these

Answer:(c) 1.54 Å

Question 21: When two halogen atoms are attached to same carbon atom then it is :

(a) vic-dihalide

(b) gem-dihalide

(c) α, ω -halide

(d) α, β -halide

Answer:(b) gem-dihalide

Question 22:   How many structural isomers are possible for a compound with molecular formula C3H7Cl ?

(a) 2

(b) 5

(c) 7

(d) 9

Answer: (a) 2

Question 25: A Grignard reagent may be made by reacting magnesium with

(a) Methyl amine

(b) Diethyl ether

(c) 7Ethyl iodide

(d) Ethyl alcohol

Answer: (c) 7Ethyl iodide

Question 26: C-Cl bond of chlorobenzene in comparison to C-Cl bond in methyl chloride is

(a) Longer and weaker

(b) Shorter and weaker

(c) 7Shorter and stronger

(d) Longer and stronger

Answer: (c) 7Shorter and stronger

Question 27: 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: (d) (CH3)3C-I

Question 28: 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: (b) 3-Bromopentane

Question 29: 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: (a) 2-Bromobutane

Question 30: 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: (a) SN1 mechanism

Question 31: Valency of carbon is

(a) 1

(b) 2

(c) 3

(d) 4

Answer: (d) 4

Question 32: Criteria for purity of organic solid is

(a) boiling point

(b) melting point

(c) specific gravity

(d) none of these

Answer: (b) melting point

Question 33: IUPAC name of CH3CH2C(Br) = CH—Cl is

(a) 2-bromo-1-chloro butene

(b) 1-chloro-2-bromo butene

(c) 3-chloro-2-bromo butene

(d) None of the above

Answer: (a) 2-bromo-1-chloro butene

Question 34: The IUPAC name of CH2 = CH—CH2Cl is

(a) Allyl chloride

(b) 1-chloro-3-propene

(c) Vinyl chloride

(d) 3-chloro-1-propene

Answer: (d) 3-chloro-1-propene

Question 35: A solution of (+) 2-chloro-2-phenylethane in toluene racemises slowly in the presence of a small amount of SbCl5, due to the formation of

(a) carbanion

(b) carbene

(c) free radical

(d) carbocation

Answer: (d) carbocation

Question 36: The decreasing order of boiling points of alkyl halides is

(a) RF > RCl > RBr > RI

(b) RBr > RCl > RCl > RF

(c) RI > RBr > RCl > RF

(d) RCl > RF > RI > RBr

Answer: (c) RI > RBr > RCl > RF

Question 37: Which of the following halide is 2° ?

(a) Isopropyl chloride

(b) Isobutyl chloride

(c) n-propyl chloride

(d) n-butyl chloride

Answer: (a) Isopropyl chloride

Question 38: Halogenation of alkanes is

(a) a reductive process

(b) an oxidative process

(c) an isothermal process

(d) an endothermal process

Answer: (b) an oxidative process

Question 39: Phosgene is commonly known as

(a) thionyl chloride

(b) carbonyl chloride

(c) carbon dioxide and phosphine

(d) phosphoryl chloride

Answer: (b) carbonyl chloride

Question 40:  The reaction of tert butyl bromide with sodium methoxide produces mainly

(a) isobutane

(b) isobutylene

(c) tert-butyl methyl ether

(d) sodium tert butoxide

Answer: (b) isobutylene

Question 41: Number of π bonds in ethyne is

(a) 1

(b) 2

(c) 3

(d) 4

Answer: (b) 2

Question 42: The compound having general formula CnH2n+2 is

(a) Alkene

(b) Alkyne

(c) Alkane

(d) none of these

Answer: (c) Alkane

Question 43: Bromination of methane in presence of sunlight is a

(a) nucleophilic substitution

(b) free radical substitution

(c) electrophilic substitution

(d) nucleophilic addition

Answer: (b) free radical substitution

Question 44: Which of the following reactions follows Markovnikov’s rule?

(a) C2H4 + HBr

(b) C3H6 + Cl6

(c) C3H6 + HBr

(d) C3H6 + Br2

Answer: (c) C3H6 + HBr

Question 45: Which of the following compounds will have highest melting point?

(a) Chlorobenzene

(b) o-Dichlorobenzene

(c) m-Dichlorobenzene

(d) p-Dichlorobenzene

Answer: (d) p-Dichlorobenzene

Question 46: Ethyl alcohol is obtained when ethyl chloride is boiled with

(a) alcoholic KOH

(b) aqueous KOH

(c) water

(d) aqueous KMnO4

Answer: (b) aqueous KOH

Question 47: Which of the following will have the maximum dipole moment?

(a) CH3F

(b) CH3Cl

(c) CH3Br

(d) CH3I

Answer: (b) CH3Cl

Question 48: Phosgene is a common name for

(a) phosphoryl chloride

(b) thionyl chloride

(c) carbon dioxide and phosphine

(d) carbonyl chloride

Answer: (d) carbonyl chloride

Question 49: The alkyl halide is converted into an alcohol by

(a) elimination

(b) dehydrohalogenation

(c) addition

(d) substitution

Answer: (d) substitution

Question 50: Ethylene dichloride can be prepared by adding HCl to

(a) Ethane

(b) Ethylene

(c) Acetylene

(d) Ethylene glycol

Answer: (d) Ethylene glycol

-: End of Haloalkanes and Haloarenes MCQ Type Questions for ISC Class-12 Ch-10 Solutions :-

-: also visit :-

ICSE Class-12 Text book Solutions, Notes , Syllabus, Paper, Notes

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