An organic compound [A] , on heating with conc. at gives a neutral compound [B] . Compound [B] on…

An organic compound [A] $\text{C}_2\text{H}_6\text{O}$, on heating with conc. $\text{H}_2\text{SO}_4$ at $413\text{ K}$ gives a neutral compound [B] $\text{C}_4\text{H}_{10}\text{O}$. Compound [B] on treatment with $\text{PCl}_5$ gives a product, which on subsequent treatment with $\text{KCN}$ yields compound [C] $\text{C}_3\text{H}_5\text{N}$. Compound [C] on hydrolysis gives an acid [D] $\text{C}_3\text{H}_6\text{O}_2$. Identify the compounds [A], [B], [C] and [D].