Identify the product in the following reaction sequence:
$3,4,5-\text{Tribromoaniline} \xrightarrow[\text{(ii) } H_3PO_2]{\text{(i) diazotization}} ?$

Choose the correct colour of the product for the following reaction.

$CH_3CH_2Br$ $\xrightarrow{AgCN} A$ $\xrightarrow{H_2, Ni} B$. The final product $(B)$ is

Assertion : Nitration of aniline can be conveniently done by protecting the amino group by acetylation.
Reason : Acetylation increases the electron density in the benzene ring.

Aniline reacts with mixed acid (conc. $HNO_3$ and conc. $H_2SO_4$) at $288 \ K$ to give $P$ $(51 \%)$,$Q$ $(47 \%)$ and $R$ $(2 \%)$. The major product$(s)$ of the following reaction sequence is (are):
$R$ $\xrightarrow[2) Br_2, CH_3CO_2H]{1) Ac_2O, \text{pyridine}}$ $\xrightarrow{3) H_3O^+}$ $\xrightarrow{4) NaNO_2, HCl / 273-278 \ K}$ $\xrightarrow{5) EtOH, \Delta}$ $\xrightarrow{6) Sn/HCl}$ $\xrightarrow{7) Br_2/H_2O \text{ (excess)}} \text{Major Product}$

Which of the following cyclic amines has the lowest $\Delta G^{o}$ for inversion?