Which of the following possess powerful mustard smell (and are called mustard oils)?

In the reaction $RNH_2 + CHCl_3 + 3KOH(alc.) \rightarrow A + 3KCl + 3H_2O$,the product $A$ can be converted back to $RNH_2$ by which process?

The descending order of basicity of the following amines is $:$
$(A)$ Aniline
$(B)$ $p$-Methoxyaniline
$(C)$ $p$-Nitroaniline
$(D)$ Methylamine
$(E)$ Dimethylamine
Choose the correct answer from the options given below $:$

Consider the following reactions and identify the correct reaction.

In the following reaction,the product $(A)$ is a yellow dye. Identify $(A)$.

Assertion : Amines are basic in nature.
Reason : Presence of a lone pair of electrons on the nitrogen atom.