Predict the product of the following reaction:
$C_6H_5NHCH_3 + NaNO_2 + HCl \rightarrow \text{Product}$

Identify $Z$ in the following sequence of reactions.

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:

In the following reaction $X$ is
$CH_3NH_2 + X + KOH \to CH_3NC$ (highly offensive odour)

Aniline in a set of the following reactions yielded a coloured product $Y$.
Aniline $\xrightarrow[(273-278 \ K)]{NaNO_{2}/HCl} X$ $\xrightarrow{N,N-dimethylaniline} Y$
The structure of $Y$ would be

Which of the following reactions does $NOT$ involve the replacement of the diazonium group?