The correct order of reactivity of aldehydes and ketones towards hydrogne 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 $H C H O > C H_{3} C H O > C H_{3} C O C H_{3}$
Aldehydes are more reactive towards $H C N$ than ketones. In aldehydes lower the aldehyde or alkyl group higher the reactivity towards $H C N$ . This is because of the low steric hindrance.
Therefore order of reactivity is
$H C H O > C H_{3} C H O > C H_{3} C O C H_{3}$

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