At $0°\mathrm{C}$ temperature reaction of aniline with ${\mathrm{HNO}}_2$ and subsequent treatment with alkaline $\beta$ -naphthol solution produces a precipitate whose colour would be :-

Identify $\mathrm{B},\mathrm{X}$ and $\mathrm{R}$ Respectively in the following sequence of reactions

${\mathrm{CH}}_3\mathrm{MgBr} \stackrel{{\mathrm{CH}}_3\mathrm{CN}}{⟶}\mathrm{A}\stackrel{{\mathrm{H}}_3{\mathrm{O}}^{+}}{⟶}\boxed{\mathrm{B}}$
${\mathrm{CH}}_3{\mathrm{COCH}}_3\underset{\mathrm{NaOH}}{\overset{{\mathrm{I}}_2}{\to }}\boxed{\mathrm{X}}\stackrel{\mathrm{Ag}}{⟶}\mathrm{Y}$

${\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NH}}_2\underset{0-5°\mathrm{C}}{\overset{{\mathrm{NaNO}}_2/\mathrm{HCl}}{\to }}\mathrm{P}\stackrel{\mathrm{CuCN}}{\to }\mathrm{Q}\underset{\mathrm{EtOH}}{\overset{\mathrm{Na}}{\to }}\boxed{\mathrm{R}}$

The correct order of decreasing basic strength is:

Assertion (A): Acetamide one reaction with ${\mathrm{Br}}_2/\mathrm{NaOH}$ give ${\mathrm{CH}}_3-{\mathrm{NH}}_2$.

Reason (R): Carbon of amide functional group becomes part of ${\mathrm{Na}}_2{\mathrm{CO}}_3$.

Assertion (A): Diazonium salt is prepared at low temperature.

Reason (R): Diazonium salt is hydrolysed to give phenol.