The reactivity towards nucleophilic addition reaction of
$(I) HCHO$,
$(II) CH_3CHO$,
$(III) CH_3COCH_3$ is

Statement $I$: Aldehyde on reaction with $HCN$ gives Cyanohydrin.
Statement $II$: Cyanohydrin is a compound which consists of hydroxy and cyano groups on the same carbon.
Choose the correct answer from the following with reference to above statements.

The product of the following reaction is:

Which of the following does not give an Aldol condensation reaction?

Which of the following compounds cannot form iodoform?

Assertion : Benzaldehyde is more reactive than ethanol towards nucleophilic attack.
Reason : The overall effect of $-I$ and $+R$ effect of phenyl group decreases the electron density on the carbon atom of $>C=O$ group in benzaldehyde.