The solution of Fehling $B$ contains . . . . . . .

The reactants $(A)$ and $(B)$ are:

One of the products of the following reaction is $P$. Structure of $P$ is

Carbonyl compounds can generally be converted to hydrocarbons by

The suitable reagents $X$ and $Y$,respectively,in the following reactions are:

An organic compound $B$ is formed by the reaction of ethylmagnesium iodide $(CH_3CH_2MgI)$ with a substance $A,$ followed by treatment with dilute aqueous acid. Compound $B$ does not react with $PCC$ in dichloromethane. Identify $A$.