Which of the following form a crystalline addition product with saturated aqueous sodium hydrogen sulphite under the usual textbook conditions (aldehydes, methyl ketones and unhindered cyclic ketones)?

Abenzophenone, $(C X_{6} H X_{5}) X_{2} C = O$
Bpropanal
Cacetophenone, $C X_{6} H X_{5} - CO - CH X_{3}$
Dbutan-2-one

Answer: B, D

Propanal is an aldehyde and butan-2-one is a methyl ketone, so both add bisulphite. Acetophenone and benzophenone are conjugated and sterically hindered by phenyl groups, so they give no appreciable adduct.

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