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

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

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?

Identify the compounds $A$ and $B$ involved in the formation of given aldol