The major product formed in carbylamine reaction is

Which one among the following statements is true?

The compound obtained by the reaction between primary amine and aldehyde is:

Rank the following species in order of decreasing nucleophilicity in a polar protic solvent (most $\to$ least nucleophilic):
$(1) \ CH_3CH_2CH_2O^{-}$,$(2) \ CH_3CH_2CH_2S^{-}$,$(3) \ CH_3CH_2C(=O)O^{-}$

Which of the following statements is incorrect in case of Hofmann bromamide degradation?

$C_{6}H_{5}NO_{2}$ $\xrightarrow{Sn+HCl} A$ $\xrightarrow{C_{6}H_{5}N_{2}^{\oplus}Cl^{\ominus}} P$
(Yellow coloured compound)
Consider the above reaction,the Product "$P$" is: