n− Propanol on treatment with concentrated HBr gives P. The product P on reaction with KCN gave the product Q. The product Q on heating with aqueous acidic solution, furnished the product R. The product ' R ' is
n-alcohol on reaction with hydrohalide gives alkyl halide. Further, reaction of alkyl halide with KCN followed by hydrolysis leads to formation of acid which have 1 carbon atom more than parent compound. The reaction involved is as follows