Predict the major product $P$ in the following reaction.

$A$ student performed an analysis of an aliphatic organic compound '$X$' which, upon analysis, gave $C=61.01\%$, $H=15.25\%$, $N=23.74\%$. This compound, on treatment with $HNO_2/H_2O$, produced another compound '$Y$' which did not contain any nitrogen atom. However, the compound '$Y$' upon controlled oxidation produced another compound '$Z$' that responded to the iodoform test. The structure of '$X$' is:

Identify substrate $A$ in the following reaction.
$A + AgOH \xrightarrow[ii) \Delta]{i) \text{moist } Ag_2O} CH_3CH_2N(CH_3)_2 + CH_2=CH_2$

Choose the correct order of basicity of the following compounds in the aqueous phase:
$(A)$ $(C_2H_5)_2NH$
$(B)$ $C_2H_5NH_2$
$(C)$ $NH_3$
$(D)$ $C_6H_5NH_2$

In the given chemical reaction $CH_3CH_2NH_2 + CHCl_3 + 3KOH \rightarrow X + Y + 3H_2O$,what are $X$ and $Y$ respectively?

Select the compound which on treatment with nitrous acid liberates nitrogen.