$A$ hydrocarbon $A$ $(C_{4}H_{8})$ on reaction with $HCl$ gives a compound $B$ $(C_{4}H_{9}Cl)$ which on reaction with $1 \ mol$ of $NH_{3}$ gives compound $C$ $(C_{4}H_{11}N)$. On reacting with $NaNO_{2}$ and $HCl$ followed by treatment with water,compound $C$ yields an optically active compound $D$. The compound $D$ is

The product formed from the following reaction sequence is:

Which one of the following compounds when heated with $KOH$ and a primary amine gives the carbylamine test?

$(CH_3)_2CHCONH_2$ $\xrightarrow{Br_2/NaOH} A$ $\xrightarrow{COCl_2} B$. In this reaction sequence,$B$ is:

The electrolytic reduction of nitrobenzene in a strongly acidic medium produces:

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: $\alpha$-halocarboxylic acid on reaction with dil. $NH_3$ gives good yield of $\alpha$-amino carboxylic acid whereas the yield of amines is very low when prepared from alkyl halides.
Reason $(R)$: Amino acids exist in zwitter ion form in aqueous medium.
In the light of the above statements,choose the correct answer from the options given below: