When a hydrocarbon $\mathrm{A}$ undergoes complete combustion it requires $11$ equivalents of oxygen and produces $4$ equivalents of water. What is the molecular formula of $\mathrm{A}$?

A solution of ${\mathrm{FeCl}}_3$ when treated with ${\mathrm{K}}_4\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]$ gives a prussian blue precipitate due to the formation of

Number of isomeric compounds with molecular formula ${\mathrm{C}}_9{\mathrm{H}}_{10}\mathrm{O}$ which

(i) do not dissolve in $\mathrm{NaOH}$
(ii) do not dissolve in $\mathrm{HCl}$.

(iii) do not give orange precipitate with $2,4$ - DNP

(iv) on hydrogenation give identical compound with molecular formula ${\mathrm{C}}_9{\mathrm{H}}_{12}\mathrm{O}$ 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: