Toluene on reaction with reagent $A$ gives $X$. This $(X)$ forms 2, 4 dinitrophenylhydrazone and reduces ammoniacal silver nitrate solution. Reaction of toluene with another reagent $B$ forms $Y$, which dissolves in $\mathrm{NaHCO}_3$ with evolution of $\mathrm{CO}_2$. What are $A$ and $B$ respectively?

$$ \text { Observe the following set of reactions } $$

$$ \text { What are } X, Y \text { and } Z \text { respectively } $$

The reaction of benzene with CO and HCl in the presence of anhydrous $\mathrm{AlCl}_3$ gives a compound $X \cdot X$ can also be obtained from which of the following reaction?

Which of the following reactions is an example of Clemmensen reduction?