CBSE Class 12 Chemistry 2019 Delhi Set 1 Solved Paper

Question : 21 of 27

Marks: +1, -0

(i) Out of

( {\CH}_3) _3 {\C}- {\Br}

and

( {\CH}_3) _3 {\C}- {\I}

, which one is more reactive towards

{\S}_{ {\N} }1

and why?
(ii) Write the product formed when p-nitrochlorobenzene is heated with aqueous

{\NaOH}

at 443

{\K}

followed by acidification.
(iii) Why dextro - and laevo - rotatory isomers of Butan-2-ol are difficult to separate by fractional distillation?

Solution:

(i) Within a group, larger atoms are better nucleophiles.

{\I}^{-}> {\Br}^{-}> {\Cl}^{-}> {\F}^{-}

, therefore

{\I}^{-}

is better leaving group than

{\Br}^{-}

.
(ii)

The presence of an electron withdrawing group

(- {\NO}_2)

at ortho- and para-positions increases the reactivity of haloarenes.

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