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NEET levelSingle correct optionDifficulty 1 of 3co064

Which of the following cannot form an enolate and therefore cannot act as the nucleophile in an aldol reaction?

Aethanal
Bbenzaldehyde
Cpropanone
Dpropanal

Answer: B

Benzaldehyde,

C X_{6} H X_{5} CHO

, has no alpha-hydrogen. Ethanal, propanone and propanal all have alpha-hydrogens and form enolates.

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