The compound $X$ in the reaction is: $X$ $\xrightarrow{CH_3MgI} Y$ $\xrightarrow{\text{hydrolysis}} Mg(OH)I + CH_3COOH$

The major product in the following reaction is:

How is formic acid prepared?

Toluene on reaction with reagent $A$ gives $X$. This $(X)$ forms $2,4-$dinitrophenylhydrazone and reduces ammonical silver nitrate solution. Reaction of toluene with another reagent $B$ forms $Y$,which dissolves in $NaHCO_3$ with evolution of $CO_2$. What are $A$ and $B$ respectively?

The oxidation of ethylbenzene with $KMnO_4$ yields which of the following compounds?

Which among the following reactions forms acid anhydride?