Question

Which one of the following does not form sodium bisulphite addition product with sodium bisulphite solution?

• A. $C{H}_{3}COC{H}_3$
• B. $C_6{H}_{5}COC{H}_3$
• C. $C_6{H}_{5}CHO$
• D. $C{H}_{3}CHO$

Answer 1

Answer: (B)

$C_6{H}_{5}COC{H}_3$

Aldehydes react with sodium bisulphite (sodium hydrogen sulphite) to give addition products. Ketones, except for methyl ketones, do not react with sodium bisulphite due to steric hinderance (crowding).

Acetophenone $\left(C_6{H}_{5}COC{H}_3\right)$ does not give addition product with sodium bisulphite $\left(NaHS{O}_3\right)$ solution. This is because two bulkier groups are attached with the carbonyl carbon. These groups decrease the reactivity of carbonyl carbon.
Hence, the correct option is B.