Which of the following will give $N_2$ gas on treatment with nitrous acid?

Reaction of primary amines with aldehydes yields

$H_3CCONH_2 + Br_2 + 4NaOH \longrightarrow Y + Na_2CO_3 + 2NaBr + 2H_2O$
What is $Y$ in the above reaction?

Which of the following amines acts as the strongest base?

Nitrobenzene on reduction with zinc and $NH_4Cl$ gives:

Given below are two statements:
Statement $I$: Pure Aniline and other arylamines are usually colourless.
Statement $II$: Arylamines get coloured on storage due to atmospheric reduction.
In the light of the above statements,choose the most appropriate answer from the options given below: