Identify $B$ formed in the reaction: $Cl-(CH_2)_4-Cl$ $\xrightarrow{\text{excess } NH_3} A$ $\xrightarrow{NaOH} B + H_2O + NaCl$

Which of the following statements is correct?

In the following reaction sequence,$C_2H_5NH_2$ $\xrightarrow{HNO_2} A$ $\xrightarrow{PCl_5} B$ $\xrightarrow{NH_3} C$,the compound '$C$' is

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:

When an organic compound was treated with sodium nitrite and hydrochloric acid in the ice-cold condition,nitrogen gas was evolved copiously. The compound is

Arrange the following bases in decreasing order of basicity:
$(i)$ Aniline
$(ii)$ $o$-nitroaniline
$(iii)$ $m$-nitroaniline
$(iv)$ $p$-nitroaniline