Which of the following do not give aldol reaction with dil.NaOH?
A
CH3CHO
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B
CD3CHO
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C
CH3COCH3`
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D
PhCHO
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Solution
The correct option is APhCHO The presence of alpha hydrogen in necessary for a compound to undergo aldol condensation reaction. Since benzaldehyde(PhCHO) does not have any alpha hydrogen, it will not give aldol reaction with dil. NaOH