Reduction of alkyl nitrites yields

The correct order of basicity for the following molecules is $:$

Which reagent,when reacted with a primary amine,evolves nitrogen gas?

Identify substrate $A$ in the following conversion.
$A + \underset{\text{(excess)}}{CH_3 I} \xrightarrow{\Delta} C_2 H_5(CH_3)_3 N^+ I^-$

In the reaction,$P, Q$ and $R$ respectively are:

Identify product $A$ in the following reaction:
$C_6H_5N_2^+Cl^- \xrightarrow{C_2H_5OH} A + N_2 + CH_3CHO + HCl$