Please refer to Chapter 10 Haloalkanes and Haloarenes MCQ Class 12 Chemistry with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 12 Chemistry. Students should refer to MCQ Questions for Class 12 Chemistry with Answers to score more marks in Grade 12 Chemistry exams. Students should read the chapter Haloalkanes and Haloarenes and then attempt the following objective questions.

MCQ Questions Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes

Haloalkanes and Haloarenes MCQ Class 12 Chemistry provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

Question. The compound which contains all the four 1°, 2°, 3° and 4° carbon atoms is
(a) 2, 3-dimethyl pentane
(b) 3-chloro-2, 3-dimethylpentane
(c) 2, 3, 4-trimethylpentane
(d) 3, 3-dimethylpentane

Question. Which of the following halide is 2° ?
(a) Isopropyl chloride
(b) Isobutyl chloride
(c) n-propyl chloride
(d) n-butyl chloride

Question. Phosgene is a common name for
(a) phosphoryl chloride
(b) thionyl chloride
(c) carbon dioxide and phosphine
(d) carbonyl chloride

Question. Which of the following is a primary halide?
(a) Isopropyl iodide
(b) Secondary butyl iodide
(c) Tertiary butyl bromide
(d) Neohexyl chloride

Question. Gem-dibromide is
(a) CH₃CH(Br)CH₂(Br)
(b) CH₃CBr₂CH₃
(c) CH₂(Br)CH₂CH₂
(d) CH₂BrCH₂Br

Question. IUPAC name of (CH₃)₃CCl
(a) 3-Chlorobutane
(b) 2-Chloro-2-methylpropane
(c) t-butyl chloride
(d) n-butyl chloride

Question. How many structural isomers are possible for a compound with molecular formula C₃H₇Cl ?
(a) 2
(b) 5
(c) 7
(d) 9

Question. Which of the following will have the maximum dipole moment?
(a) CH₃F
(b) CH₃Cl
(c) CH₃Br
(d) CH3I

Question. Halogenation of alkanes is
(a) a reductive process
(b) an oxidative process
(c) an isothermal process
(d) an endothermal process

Question. Chlorobenzene is prepared commercially by
(a) Raschig process
(b) Wurtz Fittig reaction
(c) Friedel-Craft’s reaction
(d) Grignard reaction

Question. A Grignard reagent may be made by reacting magnesium with
(a) Methyl amine
(b) Diethyl ether
(c) Ethyl iodide
(d) Ethyl alcohol

Question. Which one of the following halogen compounds is difficult to be hydrolysed by S_N1 mechanism?
(a) Tertiary butyl chloride
(b) Isopropyl chloride
(c) Benzyl chloride
(d) Chlorobenzene

Question. Ethylene dichloride can be prepared by adding HCl to
(a) Ethane
(b) Ethylene
(c) Acetylene
(d) Ethylene glycol

Question. The best method for the conversion of an alcohol into an alkyl chloride is by treating the alcohol with
(a) PCl₅
(b) dry HCl in the presence of anhydrous ZnCl₂
(c) SOCl2 in presence of pyridine
(d) None of these

Question. The order of reactivity of the given haloalkanes towards nucleophile is :
(a) RI > RBr > KCl
(b) RCl > RBr > RI
(c) RBr > RCl > RI
(d) RBr > RI > RCl

Question. In the preparation of chlorobenzene from aniline, the most suitable reagent is
(a) Chlorine in the presence of ultraviolet light
(b) Chlorine in the presence of AlCl₃
(c) Nitrous acid followed by heating with Cu₂Cl₂
(d) HCl and Cu₂Cl₂

Question. Which of the following possesses highest melting point?
(a) Chlorobenzene
(b) m-dichlorobenzene
(c) o-dichlorobenzene
(d) p-dichlorobenzene

Question. SN₂ mechanism proceeds through intervention of
(a) carbonium ion
(b) transition state
(c) free radical
(d) carbanion

Question. Isopropyl chloride undergoes hydrolysis by
(a) S_N1 mechanism
(b) S_N2 mechanism
(c) S_N1 and S_N2 mechanisms
(d) Neither S_N1 nor S_N2 mechanism

Question. Tertiary alkyl halides are practically inert to substitution by S_N2 mechanism because of
(a) steric hindrance
(b) inductive effect
(c) instability
(d) insolubility

Question. Most reactive halide towards S_N1 reaction is
(a) n-Butyl chloride
(b) sec-Butyl chloride
(c) tert-Butyl chloride
(d) Allyl chloride

Question. In SN1 reaction, the recemization takes place. It is due to
(a) inversion of configuration 
(b) retention of configuration
(c) conversion of configuration
(d) Both (a) and (b)

Question. Which of the following is an optically active compound ?
(a) 1-Butanol
(b) 1-Propanol
(c) 2-Chlorobutane
(d) 4-Hydroxyheptane

Question. An important chemical method to resolve a racemic mixture makes use of the formation of
(a) a meso compound 
(b) enantiomers
(c) diasteromers
(d) racemates

Question. Which of the following will have a mesoisomer also?
(a) 2, 3- Dichloropentane
(b) 2, 3-Dichlorobutane
(c) 2-Chlorobutane
(d) 2-Hydroxypropanoic acid

Question. Optically active isomers but not mirror images are called
(a) enantiomers
(b) mesomers
(c) tautomers
(d) diastereomers

Question. An alkyl halide reacts with metallic sodium in dry ether. The reaction is known as :
(a) Frankland’s reaction
(b) Sandmeyer’s reaction
(c) Wurtz reaction
(d) Kolbe’s reaction

Question. When 2-bromobutane reacts with alcoholic KOH, the reaction is called
(a) halogenation
(b) chlorination
(c) hydrogenation
(d) dehydrohalogenation

Question. Which of the following alkyl halides is used as a methylating agent?
(a) C₂H₅Br
(b) C₆H₅Cl
(c) CH₃I
(d) C₂H₅Cl

Question. Mg reacts with RBr best in
(a) C₂H₅OC₂H₅
(b) C₆H₅OCH₃
(c) C₆H₅N(CH₃)₂
(d) Equally in all the three

Question. Which of the following compounds is optically active ?
(a) CH₃CHClCOOH
(b) CH₃CH₂CH₂CH₃
(c) (CH₃)₂CHOH
(d) (CH₃)₃CCl

Question. An organic molecule necessarily shows optical activity if it
(a) contains asymmetric carbon atoms
(b) is non-polar
(c) is non-superimposable on its mirror image
(d) is superimposable on its mirror image

Question. An alkyl halide by formation of its Grignard reagent and heating with water yields propane. What is the original alkyl halide ?
(a) Methyl iodide
(b) Ethyl iodide
(c) Ethyl bromide
(d) Propyl bromide

Question. 2-Bromopentane is heated with potassium ethoxide in ethanol. The major product obtained is
(a) 2-ethoxypentane
(b) pentene-1
(c) trans-2-pentene
(d) cis-pentene-2

Question. Which of these can be used as moth repellant
(a) Benzene hexachloride
(b) Benzal chloride
(c) Hexachloroethane
(d) Tetrachloroethane

Question. An organic compound A (C₄H₉Cl) on reaction with Na/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

Question. Benzene reacts with CH₃Cl in the presence of anhydrous AlCl₃ to form :
(a) chlorobenzene
(b) benzylchloride
(c) xylene
(d) toluene

Question. C – Cl bond of chlorobenzene in comparison to C – Cl bond in methyl chloride is
(a) Longer and weaker
(b) Shorter and weaker
(c) Shorter and stronger
(d) Longer and stronger

Question. Aryl halides can not be prepared by the reaction of aryl alcohols with PCl₃, PCl₅ or SOCl₂ because
(a) phenols are highly stable compounds.
(b) carbon-oxygen bond in phenols has a partial double bond character.
(c) carbon-oxygen bond is highly polar
(d) all of these

Question. Freon (dichlorodifluoro methane) is used
(a) as local anaesthetic
(b) for dissolving impurities in metallurgical process
(c) in refrigerator
(d) in printing industry

Question. Which of the following is not used in Friedel-Crafts reaction?
(a) N–Phenyl acetanilide
(b) Bromobenzene
(c) Benzene
(d) Chlorobenzene

Question. Which one is most reactive towards SN1reaction ?
(a) C₆H₅CH(C₆H₅)Br
(b) C₆H₅CH(CH₃)Br
(c) C₆H₅C(CH₃)(C₆H₅)Br
(d) C₆H₅CH₂Br

Question. Chlorobenzene can be prepared by reacting aniline with :
(a) hydrochloric acid
(b) cuprous chloride
(c) chlorine in presence of anhydrous aluminium chloride
(d) nitrous acid followed by heating with cuprous chloride

Question. Haloarenes are ortho and para directing due to
(a) Resonance in aryl halide
(b) – I effect of halogen atom
(c) + I effect of halogen atom
(d) Both (a) and (b)

Question. Chlorobenzene reacts with Mg in dry ether to give a compound (A) which further reacts with ethanol to yield
(a) Phenol
(b) Benzene
(c) Ethylbenzene
(d) Phenyl ether

Question. On sulphonation of C₆H₅Cl
(a) benzene sulphonic acid is formed
(b) metachlorobenzene sulphonic acid is formed
(c) orthochlorobenzene sulphonic acid is formed
(d) ortho and para chlorobenzene sulphonic acids are formed

Question. Elimination of bromine from 2-bromobutane results in the formation of –
(a) predominantly 2-butyne
(b) predominantly 1-butene
(c) predominantly 2-butene
(d) equimolar mixture of 1 and 2-butene

Question. Which of the following can be used as solvent for grignard reagent ?
(a) H₂O
(b) C₂H₅OH
(c) CH₃OH
(d) C₂H₅OC₂H₅

Question. Chloropicrin is obtained by the reaction of
(a) steam on carbon tetrachloride
(b) nitric acid on chlorobenzene
(c) chlorine on picric acid
(d) nitric acid on chloroform

Question. Use of chlorofluorocarbons is not encouraged because
(a) They are harmful to the eyes of people that use it
(b) They damage the refrigerators and air conditioners
(c) They eat away the ozone in the atmosphere
(d) They destroy the oxygen layer

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