$A$ compound $X$ on reaction with chloroform and $NaOH$ gives a compound with a very unpleasant odour. $X$ is

$A$ colourless organic compound gives brisk effervescence with a mixture of sodium nitrite and dil. $HCl$. It could be

The amine that reacts with Hinsberg's reagent to give an alkali-insoluble product is:

How can you distinguish between aniline and methylamine?

Match List-$I$ with List-$II$ and select the correct option:

List-$I$ (Functional group)	List-$II$ (Functional group reagent)
$(a)$ Aliphatic Alcohol	$(i)$ Neutral ferric chloride test
$(b)$ $C_6H_5NH_2$	(ii) Azo dye test
$(c)$ $CH_3CH_2CHO$	(iii) Ceric ammonium nitrate test
$(d)$ Phenol	(iv) Tollen’s reagent test

Give one chemical test to distinguish between the following pairs of compounds:
$(i)$ Methylamine and dimethylamine
$(ii)$ Secondary and tertiary amines
$(iii)$ Ethylamine and aniline
$(iv)$ Aniline and benzylamine
$(v)$ Aniline and $N$-methylaniline.