Q.

Which of the following does not undergo disproportionation with conc. KOH

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a

CH3CHO

b

HCHO

c

C6H5CHO

d

Chloral

answer is A.

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Detailed Solution

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Aldehydes which do not have an α-hydrogen atom, undergo self oxidation and reduction
(disproportionation) reaction on heating with concentrated alkali.

CH3CHO consists of α-hydrogen atoms, So it does not undergo disproportionation with conc. KOH.

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Which of the following does not undergo disproportionation with conc. KOH