All structures given below are of vitamin $\mathrm{C}$. Most stable of them is:

Given below are two statements:

Statement I: Sulphanilic acid gives esterification test for carboxyl group.

Statement II: Sulphanilic acid gives red colour in Lassigne’s test for extra element detection.

In the light of the above statements, choose the most appropriate answer from the options given below:

Given below are two statements :

Statement I : ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$ and $\mathrm{AgCN}$ both can generate nucleophile.

Statement II : $\mathrm{KCN}$ and $\mathrm{AgCN}$ both will generate nitrile nucleophile with all reaction conditions.

Choose the most appropriate option :

In Duma's method of estimation of nitrogen, $0.1840 \mathrm{g}$ of an organic compound gave $30 \mathrm{mL}$ of nitrogen collected at $287 \mathrm{K}$ and $758 \mathrm{mm}$ of $\mathrm{Hg}$ pressure. The percentage composition of nitrogen in the compound is ______. (Round off to the Nearest Integer).

[Given : Aqueous tension at $287 \mathrm{K}=14 \mathrm{mm}$ of $\mathrm{Hg}$]