CBSE Class 12 Chemistry 2015 Solved Paper

Question : 15

Total: 26

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 (−NO2) at 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) −NO2 acts as electron withdrawing group or −I effect.

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