One per cent composition of an organic compound $\underline {A}$ is carbon: $85.71 \;\%$ and hydrogen $14.29\; \%$. It's vapour density is 14. Consider the following reaction sequence :

Question

Identify $\underline{C}$.

$(1)\;CH_3 - CH-CO_2$

$(2) HO-CH_2-CH_2-CO_2H$

$(3) HO-CH_2-CO_2H$

$(4) CH_3-CH_2-CO_2H$