Haloalkanes and Haloarenes MCQ Class 12 Chemistry
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
Answer
B
Question. Which of the following halide is 2° ?
(a) Isopropyl chloride
(b) Isobutyl chloride
(c) n-propyl chloride
(d) n-butyl chloride
Answer
A
Question. Phosgene is a common name for
(a) phosphoryl chloride
(b) thionyl chloride
(c) carbon dioxide and phosphine
(d) carbonyl chloride
Answer
D
Question. Which of the following is a primary halide?
(a) Isopropyl iodide
(b) Secondary butyl iodide
(c) Tertiary butyl bromide
(d) Neohexyl chloride
Answer
D
Question. Gem-dibromide is
(a) CH3CH(Br)CH2(Br)
(b) CH3CBr2CH3
(c) CH2(Br)CH2CH2
(d) CH2BrCH2Br
Answer
B
Question. IUPAC name of (CH3)3CCl
(a) 3-Chlorobutane
(b) 2-Chloro-2-methylpropane
(c) t-butyl chloride
(d) n-butyl chloride
Answer
B
Question. How many structural isomers are possible for a compound with molecular formula C3H7Cl ?
(a) 2
(b) 5
(c) 7
(d) 9
Answer
A
Question. Which of the following will have the maximum dipole moment?
(a) CH3F
(b) CH3Cl
(c) CH3Br
(d) CH3I
Answer
B
Question. Halogenation of alkanes is
(a) a reductive process
(b) an oxidative process
(c) an isothermal process
(d) an endothermal process
Answer
B
Question. Chlorobenzene is prepared commercially by
(a) Raschig process
(b) Wurtz Fittig reaction
(c) Friedel-Craft’s reaction
(d) Grignard reaction
Answer
A
Question. A Grignard reagent may be made by reacting magnesium with
(a) Methyl amine
(b) Diethyl ether
(c) Ethyl iodide
(d) Ethyl alcohol
Answer
C
Question. Which one of the following halogen compounds is difficult to be hydrolysed by SN1 mechanism?
(a) Tertiary butyl chloride
(b) Isopropyl chloride
(c) Benzyl chloride
(d) Chlorobenzene
Answer
D
Question. Ethylene dichloride can be prepared by adding HCl to
(a) Ethane
(b) Ethylene
(c) Acetylene
(d) Ethylene glycol
Answer
D
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
Answer
C
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
Answer
A
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
Answer
C
Question. Which of the following possesses highest melting point?
(a) Chlorobenzene
(b) m-dichlorobenzene
(c) o-dichlorobenzene
(d) p-dichlorobenzene
Answer
D
Question. SN2 mechanism proceeds through intervention of
(a) carbonium ion
(b) transition state
(c) free radical
(d) carbanion
Answer
B
Question. Isopropyl chloride undergoes hydrolysis by
(a) SN1 mechanism
(b) SN2 mechanism
(c) SN1 and SN2 mechanisms
(d) Neither SN1 nor SN2 mechanism
Answer
C
Question. Tertiary alkyl halides are practically inert to substitution by SN2 mechanism because of
(a) steric hindrance
(b) inductive effect
(c) instability
(d) insolubility
Answer
B
Question. Most reactive halide towards SN1 reaction is
(a) n-Butyl chloride
(b) sec-Butyl chloride
(c) tert-Butyl chloride
(d) Allyl chloride
Answer
C
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)
Answer
D
Question. Which of the following is an optically active compound ?
(a) 1-Butanol
(b) 1-Propanol
(c) 2-Chlorobutane
(d) 4-Hydroxyheptane
Answer
C
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
Answer
C
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
Answer
B
Question. Optically active isomers but not mirror images are called
(a) enantiomers
(b) mesomers
(c) tautomers
(d) diastereomers
Answer
D
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
Answer
C
Question. When 2-bromobutane reacts with alcoholic KOH, the reaction is called
(a) halogenation
(b) chlorination
(c) hydrogenation
(d) dehydrohalogenation
Answer
D
Question. Which of the following alkyl halides is used as a methylating agent?
(a) C2H5Br
(b) C6H5Cl
(c) CH3I
(d) C2H5Cl
Answer
C
Question. Mg reacts with RBr best in
(a) C2H5OC2H5
(b) C6H5OCH3
(c) C6H5N(CH3)2
(d) Equally in all the three
Answer
A
Question. Which of the following compounds is optically active ?
(a) CH3CHClCOOH
(b) CH3CH2CH2CH3
(c) (CH3)2CHOH
(d) (CH3)3CCl
Answer
A
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
Answer
C
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
Answer
D
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
Answer
C
Question. Which of these can be used as moth repellant
(a) Benzene hexachloride
(b) Benzal chloride
(c) Hexachloroethane
(d) Tetrachloroethane
Answer
C
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
Answer
A
Question. Benzene reacts with CH3Cl in the presence of anhydrous AlCl3 to form :
(a) chlorobenzene
(b) benzylchloride
(c) xylene
(d) toluene
Answer
D
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
Answer
C
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
Answer
B
Question. Freon (dichlorodifluoro methane) is used
(a) as local anaesthetic
(b) for dissolving impurities in metallurgical process
(c) in refrigerator
(d) in printing industry
Answer
C
Question. Which of the following is not used in Friedel-Crafts reaction?
(a) N–Phenyl acetanilide
(b) Bromobenzene
(c) Benzene
(d) Chlorobenzene
Answer
A
Question. Which one is most reactive towards SN1reaction ?
(a) C6H5CH(C6H5)Br
(b) C6H5CH(CH3)Br
(c) C6H5C(CH3)(C6H5)Br
(d) C6H5CH2Br
Answer
C
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
Answer
D
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)
Answer
D
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
Answer
B
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
Answer
D
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
Answer
C
Question. Which of the following can be used as solvent for grignard reagent ?
(a) H2O
(b) C2H5OH
(c) CH3OH
(d) C2H5OC2H5
Answer
D
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
Answer
D
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
Answer
C
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