Benzyl alcohol and sodium benzoate are obtained by the action of sodium hydroxide on benzaldehyde. This reaction is known as

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.

$C_6H_5CHO + HCN \to C_6H_5-CH(OH)-CN$. The product would be

The reagent with which both acetaldehyde and acetone react is

Among the following,the number of compounds which will give positive iodoform reaction is:
$(a)$ $1-$Phenylbutan$-2-$one
$(b)$ $2-$Methylbutan$-2-$ol
$(c)$ $3-$Methylbutan$-2-$ol
$(d)$ $1-$Phenylethanol
$(e)$ $3,3-$dimethylbutan$-2-$one
$(f)$ $1-$Phenylpropan$-2-$ol

Which of the following compounds does not give the iodoform test?