The Hinsberg reagent is:

Identify the major product obtained when ethyl amine $(CH_3CH_2NH_2)$ is reacted with an excess of methyl iodide $(CH_3I)$?

If $meta$-nitroaniline is chlorinated,the major product is:

Give the structure of $A$ in the following reaction.
$2\text{-Nitro-4-methylaniline} \xrightarrow[(ii) \ H_3PO_2, H_2O]{(i) NaNO_2 + HCl, 273 - 278 \ K} A$.

At $NTP$,the reaction of $1 \ mol$ of methylamine with nitrous acid will yield ......... liters of nitrogen.

Before nitration of amino benzene,the $-NH_2$ group is first protected by which of the following processes?