In the reaction $A$ $\xrightarrow{SnCl_2/HCl} B$ $\xrightarrow{NaNO_2/HCl, 0^{\circ}C} C$ $\xrightarrow{H_2O/\Delta} C_6H_5OH$,what are $A, B$,and $C$?

The reagent with which the following reaction is best accomplished is:

Which of the following diazonium salts is relatively stable at $0-5 \, ^{\circ}C$?

The action of nitrous acid on ethyl amine gives

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:

In the following reaction,the product $(A)$ is