Identify $Z$ in the following reaction:

Which of the following groups increases the basic strength of substituted aniline?

In the given reaction sequence,$Z$ is

Consider the following sequence of reactions. Total number of $sp^{3}$ hybridised carbon atoms in the major product $C$ formed is . . . . . . .

$X \ g$ of ethylamine is subjected to reaction with $NaNO_2 / HCl$ followed by water; evolved dinitrogen gas which occupied $2.24 \ L$ volume at $STP$. $X$ is . . . . . . $\times 10^{-1} \ g$.

Which of the following reduction conditions is appropriate to isolate $Azoxybenzene$ as the major reduction product of $Nitrobenzene$?