Nitrosobenzene can be prepared by oxidizing aniline with which of the following reagents?

Match List $I$ with List $II$:

List $I$ (Amines)	List $II$ $(pK_{b})$
$A$. Aniline	$I$. $3.25$
$B$. Ethanamine	$II$. $3.00$
$C$. $N$-Ethylethanamine	$III$. $9.38$
$D$. $N,N$-Diethylethanamine	$IV$. $3.29$

Choose the correct answer from the options given below:

Give the major product of the following reaction $.$

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

Which of the following compounds is the strongest base?

When a primary amine is heated with $NaNO_2/HCl$,a gas is evolved with brisk effervescence. Identify the gas.
$R-NH_2 \xrightarrow{NaNO_2/HCl} ..................$