Which of the following is separated using the Hinsberg reagent?

Find out the reaction in which the obtained product gives a positive isocyanide test.

An organic compound $A$ on treatment with benzene sulphonyl chloride gives compound $B$. $B$ is soluble in dil. $NaOH$ solution. Compound $A$ is:

Which of the following compounds does not react with $NaNO_2$ and $HCl$?

Which of the following compounds does not give the isocyanide test?

Given below are two statements:
Statement $I$: All the following compounds react with $p$-toluenesulfonyl chloride:
$C_6H_5NH_2$
$(C_6H_5)_2NH$
$(C_6H_5)_3N$
Statement $II$: Their products in the above reaction are soluble in aqueous $NaOH$.
In the light of the above statements,choose the correct answer from the options given below.