Assertion (A) Ammonia and its derivatives form $\mathrm{H}_2 \mathrm{~N}-\mathrm{Z}$ undergo condensation reaction with carbonyl compounds (aldehydes and ketones).

Reason (R) This reaction is an example of irreversible reaction.

The correct option among the following is

$$ \text { Identify } X \text { and } Y \text { in the reactions, given below } $$

A primary alcohol was reacted with pyridinium chlorochromate (PCC), which resulted in a product $P$. The product $P$ on treatment with ammonical silver nitrate solution produces

Benzene on reaction with acetyl chloride in the presence of anhydrous $\mathrm{AlCl}_3$ gave the product $P$. The product $P$ on reaction with methylmagnesium bromide followed by treatment with water furnished the product $Q$. The molecular formula of $Q$ is