An organic compound (A) on treatmentwith acetic acid in presence of concentrated H2 S o4 producers an ester (B).'A' on mild oxidation'c'.'c' reacts with 50% koH followed by acidification generates 'A' and 'D'. 'D' with pcl3 followed by reaction with NH3 gives (E).(E) on hydration process HCN. Identify the compound 'A' to 'E' and write the chemical reaction involved?
