Ketones react with $Mg-Hg$ followed by treatment with water to give:

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

The major product of the following reaction is

Predict the product $C$ in the following series of reactions:

The aldehydes which will not form a single Grignard product with one equivalent of Grignard reagent are:
$(a)$ Benzaldehyde
$(b)$ $4$-Formylbenzoic acid
$(c)$ $4$-Methoxybenzaldehyde
$(d)$ $4$-(Hydroxymethyl)benzaldehyde

What are $X$,$Y$,and $Z$ in the following reaction sequence respectively?
Benzene $\xrightarrow{X}$ Benzaldehyde $\xrightarrow{\text{Conc. NaOH}, \Delta} Y + Z$