$$ \text { In the given reaction sequence conversion of } Y \text { to } Z \text { is } $$

What are $X$ and $Y$ respectively in the following reaction sequence?

$$ \mathrm{C}_6 \mathrm{H}_5 \mathrm{~N}_2^{+} X^{-} \xrightarrow{\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}} X \xrightarrow[\text { anhy. } \mathrm{AlCl}_3]{\mathrm{CO}, \mathrm{HCl}} Y $$

How many amines with molecular formula $\mathrm{C}_3 \mathrm{H}_9 \mathrm{~N}$ can react with benzenE sulphonyl chloride?

In the following sequence of reactions, what is the end product $(D)$ ?

$$ \mathrm{C}_2 \mathrm{H}_5 \mathrm{Br} \xrightarrow{\mathrm{KCN}} A \xrightarrow{\mathrm{H}_3 \mathrm{O}^{+}} B \xrightarrow{\mathrm{LiAlH}_4} C \xrightarrow[573 \mathrm{~K}]{\mathrm{Cu}} D $$