Which of the following reactions can produce $\mathrm{R}-\mathrm{CO}-\mathrm{Ar}$?

Which of the following compounds gives a ketone with Grignard reagent?

The conversion $\mathrm{PhCN}\to {\mathrm{PhCOCH}}_3$ can be achieved most conveniently by the reaction with

The product(s) obtained via oxymercuration $\left({\mathrm{HgSO}}_4+{\mathrm{H}}_2{\mathrm{SO}}_4\right)$ of $1-$butyne would be

The addition of $\mathrm{HCN}$ to carbonyl compounds is an example of

Acetal is produced by reacting alcohol in the presence of dry $\mathrm{HCl}$ with

Acetone oxime is obtained by reacting acetone with

In the Cannizzaro reaction given below,

$2\mathrm{Ph}-\mathrm{CHO}\stackrel{{\mathrm{OH}}^{-}}{⟶}\mathrm{Ph}-{\mathrm{CH}}_2-\mathrm{OH}+{\mathrm{PhCO}}_2^{-}$ the slowest step is

Formaldehyde when reacted with methyl magnesium bromide gives