Q28 / 90 · JEE Main 2012 (07 May Online) · Chemistry

Among the following the order of reactivity towards nucleophilic addition is

A
$\mathrm{CH}_3 \mathrm{CHO}>\mathrm{CH}_3 \mathrm{COCH}_3>\mathrm{HCHO}$
Correct answer
B
$\mathrm{HCHO}>\mathrm{CH}_3 \mathrm{CHO}>\mathrm{CH}_3 \mathrm{COCH}_3$
C
$\mathrm{CH}_3 \mathrm{CHO}>\mathrm{HCHO}>\mathrm{CH}_3 \mathrm{COCH}_3$
D
$\mathrm{CH}_3 \mathrm{COCH}_3>\mathrm{CH}_3 \mathrm{CHO}>\mathrm{HCHO}$

Solution

Presence of alkyl group in carbonyl compounds decreases their reactivity towards nucleophilic addition. Further greater the number of such groups lesser will be the reactivity towards nucleophilic addition $\therefore$ correct order is

Hence, the correct answer is option: 'B'.

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