Give reasons: (a) n-Butyl bromide has higher boiling point than t-butyl bromide. (b) Racemic mixture is optically inactive. (c) The presence of nitro group (- {\NO}_2) at {\o} \/ {\p} positions increases the reactivity of haloarenes towards nucleophilic substitution reactions.

CBSE Class 12 Chemistry 2015 Solved Paper - Question 15

CBSE Class 12 Chemistry 2015 Solved Paper

Question : 15 of 26

Marks: +1, -0

Give reasons:
(a)

n

-Butyl bromide has higher boiling point than t-butyl bromide.
(b) Racemic mixture is optically inactive.
(c) The presence of nitro group

(- {\NO}_2)

{\o} \/ {\p}

positions increases the reactivity of haloarenes towards nucleophilic substitution reactions.

Solution:

(i) Larger surface area, higher van der Waals' forces, higher the boiling point.
(ii) Rotation due to one enantiomer is cancelled by another enantiomer.
(iii)

- {\NO}_2

acts as electron withdrawing group or

- {\I}

effect.

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