Which of the following reagents converts phenyl methyl ketone into ethylbenzene?

Product $(D)$ in the above sequence is:

$A$ molecule $(X)$ with the following structure is hydrolyzed under mild acidic conditions to produce $(Y)$ and $(Z)$. Identify the correct statements about $(Y)$ and $(Z)$.

Which of the following is least reactive towards nucleophilic addition?

What is an acetal? Give examples. $OR$ Give the reaction of ethanal with $(a)$ ethanol and $(b)$ ethylene glycol in the presence of dry $HCl$ gas.

The reagents $A$,$B$ and $C$ respectively are: