NCERT solution Class 12 haloalkanes and haloarenes

NCERT Solutions

Class 12 Chemistry

Haloalkanes and Haloarenes

NCERT Questions

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Q.1

Name the following halides according to IUPAC system and classify them as alkyl, allyl, and benzyl (primary, secondary, tertiary), and vinyl or aryl halides:

(i) (CH₃)₂CHCH (Cl) CH3

(ii) CH₃CH₂CH (CH₃) CH (C₂H₅) Cl

(iii) CH₃CH₂C (CH₃)₂CH₂I

(iv) (CH₃)₃CCH₂CH (Br) C6H5

(v) CH₃CH(CH₃)CH(Br)CH₃

(vi) CH₃C(C₂H₅)2CH₂Br

(vii) CH₃C(Cl)(C₂H₅)CH₂CH₃

(viii) CH₃CH=C (Cl) CH₂CH (CH₃)₂

(viii) CH₃CH=CHC (Br) (CH₃)₂

(ix) p-ClC₆H₄CH₂CH (CH₃)₂

(x) m-ClCH₂C₆H₄CH₂C (CH₃)₃

(xi) o-Br-C₆H₄CH (CH₃) CH₂CH₃

(i) 2-chloro-3-methylbutane, (2◦ alkyl halide)

The Cl atom is attached with two alkyl groups therefore 2◦ alkyl halide.

(ii) 3-chloro-4-methylhexane (2◦ alkyl halide)

The Cl atom is attached with two alkyl groups therefore 2◦ alkyl halide.

(iii) 1-iodo-2,2-dimethylbutane (1◦ alkyl halide)

The atom I is attached with one alkyl group therefore 1◦ alkyl halide.

(iv) 1-bromo-3,3-dimethyl-1-phenylbutane (2◦ benzylic halide)

The atom Br is attached with two alkyl groups with the benzene group therefore 2◦ benzylic halide.

(v) 2-bromo-3-methylbutane (2◦ alkyl halide)

The atom Br is attached with two alkyl groups therefore 2◦ alkyl halide.

(vi) 1-bromo-2-ethyl-2-methylbutane (1◦ alkyl halide)

The atom Br is attached with one alkyl group therefore 1◦ alkyl halide.)

(viii) 3-chloro-3-methylpentane (3◦ alkyl halide)

The atom Cl is attached with three alkyl groups therefore 3◦ alkyl halide.

(viii) 3-chloro-5-methylhex-2-ene (vinylic halide)

The atom Cl is attached with the double bond i.e. at vinylic position therefore vinylic halide.)

(ix) 4-bromo-4-methylpent-2-ene (allylic halide)

The Br atom is attached with the carbon next to the double bond i.e. at allylic position therefore allylic halide.

(x) 1-chloro-4-(2-methylpropyl) benzene (aryl halide)

The Cl atom is attached with the benzene i.e. at aryl position therefore aryl halide.

(xi) 1-chloro-3-(2, 2-dimethylpropyl) benzene (1◦ benzylic halide)

The Cl is attached with one alkyl group at the benzene carbon therefore 1◦ benzylic halide.

(xii) 1-bromo-2-(1-methylpropyl) benzene (aryl halide)

The Br is attached with the benzene i.e. at aryl position therefore aryl halide.

Video solution:

Haloalkanes and Haloarenes Class 12 Chemistry NCERT Chapter 6 NCERT Solutions

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