$120 \mathrm{g}$ of an organic compound which contains only carbon and hydrogen on complete combustion gives $330 \mathrm{g}$ of ${\mathrm{CO}}_2$ and $270 \mathrm{g}$ of water. The percentage of carbon and hydrogen in the organic compound are respectively

Arrange the following carbocations in decreasing order of stability.

Given below are two statements :

Statement I : In 'Lassaigne's Test', when both nitrogen and sulphur are present in an organic compound, sodium thiocyanate is formed.

Statement II : If both nitrogen and sulphur are present in an organic compound, then the excess of sodium used in sodium fusion will decompose the sodium thiocyanate formed to give $\mathrm{NaCN}$ and ${\mathrm{Na}}_2\mathrm{S}$.

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

${\left({\mathrm{C}}_7{\mathrm{H}}_5{\mathrm{O}}_2\right)}_2\stackrel{\mathrm{hv}}{⟶}\left[\mathrm{X}\right]\to 2{\dot{\mathrm{C}}}_6{\mathrm{H}}_5+2{\mathrm{CO}}_2$

Consider the above reaction and identify the intermediated '$\mathrm{X}$'