Nitrobenzene on reduction by zinc and $NH_4Cl$ gives

What is produced when aniline is heated with chloroform and alcoholic $KOH$?

Which of the following statements is true for Benzenediazonium fluoroborate?

Compound $III$ is
$\xrightarrow[{ii)\,CuCl/HCl}]{{i)\,HNO_2\,(0 - 5\,^oC)}}I$ $\xrightarrow{{Sn/HCl}}II$ $\xrightarrow[{ii)\,H_3PO_2 + H_2O}]{{i)HNO_2\,(0 - 5\,^oC)\,}}III$

Identify $A$ and $B$ in the following reactions:

In the case of substituted aniline,the group which decreases the basic strength is