Which of the following is the strongest base?

The product of the following reaction is:
$C_6H_5N_2^+Cl^-$ $\xrightarrow{H_3PO_2 / \text{ethanol}}$ ?

Isomeric amines with molecular formula $C_8H_{11}N$ give the following tests:
Isomer $(P) \Rightarrow$ Can be prepared by Gabriel phthalimide synthesis.
Isomer $(Q) \Rightarrow$ Reacts with Hinsberg's reagent to give a solid insoluble in $NaOH$.
Isomer $(R) \Rightarrow$ Reacts with $HONO$ followed by $\beta$-naphthol in $NaOH$ to give a red dye.
Isomers $(P), (Q)$ and $(R)$ respectively are:

Amongst the following,the most basic compound is:

Complete the following acid-base reactions and name the products:
$(i)$ $CH_{3}CH_{2}CH_{2}NH_{2} + HCl \rightarrow$
$(ii)$ $(C_{2}H_{5})_{3}N + HCl \rightarrow$

Considering the above reaction,$X$ and $Y$ respectively are