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Question

The compound which can't form an optically active cyanohydrin with HCN is?

A
Acetaldehyde
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B
Methyl n-propyl ketone
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C
Benzaldehyde
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D
Diethyl ketone
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Solution

The correct option is A Diethyl ketone
O
CH3CH2||CCH2CH3 - diethyl ketone
HCN
OH
CH3CH2|C|CH2CH3 which is optically inactive compound.
CN
So, diethyl ketone is a compound which can't form an optically active cyanohydrin with HCN.

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