Which of the following compounds is not soluble in $NaOH$?

In the following sequence of reaction,identify the major product $B$.

What is the nature of an aqueous solution of methylamine?

The major product formed in the following reaction is:

Which of the following substances is more basic?

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: