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Q.

Which of the following reacts at a faster rate of to form cyanohydrins

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a

HCHO

b

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c

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d

$C H_{3} C H O$

answer is A.

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Detailed Solution

addition of hydrogen cyanide is nucleophilic addition,greater the positive charge on the carbonyl carbon greater will be the rate of nucleophilic addition.except formaldehyde in the rest of members the positive charge on the carbonyl carbon is reduced due to either positive inductive effect or due to resonance therefore rate of reaction decreases

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