Question

Reactivity towards nucleophilic addition reaction of (i) $HCHO(ii)$CH_3CHO$(iii)$CH_3COCH_3$ is

• A. II > III > I
• B. III > II > I
• C. I > II > III
• D. I > II < III

Answer 1

Answer: (C)

The nucleophilic addition reaction is the characteristic addition of carbonyl compounds. Reactivity order of carbonyl compounds in the order.
This is due to increase in the intensity of charge on carbon of carbonyl group due to $+I$ -effect of alkyl groups.
Aldehydes are more reactive than ketones and also steric factor decreases rate.