Ncert Exercises & Solutions

Q. 71 Elimination reactions (especially B— etimination) are as common as the

nucleophilic substitution reaction in case of alkyl halides. Specify the

reagents used in both cases.

Elimination reactions are as common as the nucleophilic substitution reaction in case of

alkyl halides as two reactions occur simultaneously. Generally, at lower temperature and by

using weaker base nucleophilic substitution reaction occur while at higher temperature

and by using a stronger base elimination reactions (especially 8 climination) take place.

e.g., If ethyl bromide is treated with aq, KOH, at low temperature it gives ethanol while If itis

reated with ale, KOH at high temperature then it gives ethene.

$C H_{2} C H_{2} B r \to_{373 K}^{A q . K O H} C H C H O H (N u c l e o p i l i c s u b s t i t u t i o n r e a c t i o n)$
$E t h a n o l$
$C H_{2} C H_{2} B r \to_{473.523 K}^{A q . K O H} C H_{2} C H_{2} (E l i m i n a t i o n r e a c t i o n)$
$E t h e n e$

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