When acetamide is treated with $HNO_2,$ the gas evolved is:

In the following compounds,the decreasing order of basic strength will be:

For the reaction shown,the correct order of the set of reagents for the conversion is:

Identify the product $C$ in the following reaction sequence:
$C_6H_5COOH$ $\xrightarrow{NH_3, \Delta} A$ $\xrightarrow{Br_2, KOH} B$ $\xrightarrow{CHCl_3, KOH} C$

Identify $(a)$ and $(b)$ in the following reaction:
$CH_3CH_2NH_2 + CHCl_3 + 3KOH \rightarrow (a) + (b) + 3H_2O$

The major product $Z$ obtained in the following reaction scheme is