The correct order of reactivity of aldehydes and ketones towards hydrogen cyanide is:

C H_{3} C O C H_{3} > C H_{3} C H O > H C H O

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C H_{3} C O C H_{3} > H C H O > C H_{3} C H O

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C H_{3} C H O > C H_{3} C O C H_{3} > H C H O

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H C H O > C H_{3} C H O > C H_{3} C O C H_{3}

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Solution

The correct option is D $H C H O > C H_{3} C H O > C H_{3} C O C H_{3}$
The correct order of reactivity of aldehydes and ketones towards hydrogen cyanide is as follows:
$H C H O > C H_{3} C H O > C H_{3} C O C H_{3}$

$H C N$ undergoes nucleophilic reaction addition reaction towards aldehydes and ketones. Aldehydes and ketones containing more electrophilic carbonyl carbon are more reactive towards nucleophilic addition reaction.

Hence aldehydes are more reactive than ketone.

So answer is D.

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