Chemistry MCQs for Class 12 with Answers Chapter 10 Haloalkanes and Haloarenes

MCQs Based On Class 12 Chemistry Chapter 10 Haloalkanes and Haloarenes

MCQ Questions for Class 12 Chemistry are prepared by the subjects experts according to the latest pattern. These MCQs are very important for students who wants to score well in CBSE Board Exam. These MCQs on chapter 10 Haloalkanes and Haloarenes will also help students in understanding the concepts very well.

Q.1. Gem-dibromide is
(a) CH₃CH(Br)CH₂(Br)
(b) CH₃CBr₂CH₃
(c) CH₂(Br)CH₂CH₂
(d) CH₂BrCH₂Br

Answer

Ans. (b) Gem-dihalides are those in which two halogen atoms are attached on the same carbon atom.

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

Answer

Ans. (b)

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Q.3. Which of the following is a primary halide?
(a) Isopropyl iodide
(b) Secondary butyl iodide
(c) Tertiary butyl bromide
(d) Neohexyl chloride

Answer

Ans. (d)

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Q.4. 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

Ans. (b)

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

Answer

Ans. (a)

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Q.6. 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

Ans. (b)

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Q.7. 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

Ans. (a)

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Q.8. Benzene hexachloride is
(a) 1, 2, 3, 4, 5, 6 – hexachlorocyclohexane
(b) 1, 1, 1, 6, 6, 6 – hexachlorocyclohexane
(c) 1, 6 – phenyl – 1, 6 – chlorohexane
(d) 1, 1 – phenyl – 6, 6 -chlorohexane

Answer

Ans. (a)

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Q.9. 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

Ans. (d)

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Q.10. Which of the following halide is 2° ?
(a) Isopropyl chloride
(b) Isobutyl chloride
(c) n-propyl chloride
(d) n-butyl chloride

Answer

Ans. (a)

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Q.11. Halogenation of alkanes is
(a) a reductive process
(b) an oxidative process
(c) an isothermal process
(d) an endothermal process

Answer

Ans. (b)

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Q.12. C – X bond is strongest in
(a) CH₃Cl
(b) CH₃Br
(c) CH₃F
(d) CH₃I

Answer

Ans. (c) Because of the small size of F, the C–F bond is strongest in CH3F.

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Q.13. Which of the following will have the maximum dipole moment?
(a) CH₃F
(b) CH₃Cl
(c) CH₃Br
(d) CH₃I

Answer

Ans. (b) CH3Cl has higher dipole moment than CH3F due to much longer C–Cl bond length than the C–F bond. The much longer bond length of the C–C bond outweighs the effect produced by lower electronegativity of Cl than that of F.

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Q.14. Phosgene is a common name for
(a) phosphoryl chloride
(b) thionyl chloride
(c) carbon dioxide and phosphine
(d) carbonyl chloride

Answer

Ans. (d)

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Q.15. 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

Ans. (c)

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Q.16. Ethylene dichloride can be prepared by adding HCl to
(a) Ethane
(b) Ethylene
(c) Acetylene
(d) Ethylene glycol

Answer

Ans. (d)

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Q.17. In which of the following conversions, phosphorus pentachloride is used as the reagent?
(a) H₂C = CH₂ → CH₃CH₂Cl
(b) CH₃CH₂OH → CH₃CH₂Cl
(c) H₃C-O-CH3 → CH₃Cl
(d) CH ≡ CH → CH₂ = CHCl

Answer

Ans. (b)

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Q.18. The decreasing order of boiling points of alkyl halides is
(a) RF > RCl > RBr > RI
(b) RBr > RCl > RI > RF
(c) RI > RBr > RCl > RF
(d) RCl > RF > RI > RBr

Answer

Ans. (c) For the same alkyl group, the boiling points of alkyl halides decrease in the order :
RI > RBr > RCl > RF
This is because with the increase in size and mass of halogen atom, the magnitude of van der Waal’s forces increases.

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Q.19. 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

Ans. (c)

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Q.20. Which of the following is liquid at room temperature (b.p. is shown against it)?
(a) CH₃I 42ºC
(b) CH₃Br 3ºC
(c) C₂H₅Cl 12ºC
(d) CH₃F –78ºC

Answer

Ans. (a)

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Q.21. The catalyst used in the preparation of an alkyl chloride by the action of dry HCl on an alcohol is
(a) anhydrous AlCl₃
(b) FeCl₃
(c) anhydrous ZnCl₂
(d) Cu

Answer

Ans. (c) In preparation of an alkyl chloride by the action of dry HCl, the catalyst generally used is anhydrous ZnCl2.

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Q.22. Chlorobenzene is prepared commercially by
(a) Raschig process
(b) Wurtz Fittig reaction
(c) Friedel-Craft’s reaction
(d) Grignard reaction

Answer

Ans. (a)

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Q.23. Conant Finkelstein reaction for the preparation of alkyl iodide is based upon the fact that
(a) Sodium iodide is soluble in methanol, while sodium chloride is insoluble in methanol
(b) Sodium iodide is soluble in methanol, while NaCl and NaBr are insoluble in methanol
(c) Sodium iodide is insoluble in methanol, while NaCl and NaBr are soluble
(d) The three halogens differ considerably in their electronegativity

Answer

Ans. (b)

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Q.24. Which of the following possesses highest melting point?
(a) Chlorobenzene
(b) m-dichlorobenzene
(c) o-dichlorobenzene
(d) p-dichlorobenzene

Answer

Ans. (d)

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