Sodium acetate reacts with acetyl chloride to form

$n$-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

Carboxylic acids react with diazomethane to form

An optically active compound $'X'$ having molecular formula $C_4H_8O_3$ evolves $CO_2$ with $NaHCO_3$. $'X'$ on treatment with $LiAlH_4$ gives an achiral compound. Then $'X'$ is

What is formed when $CH_3COOH$ reacts with $PCl_5$?

Which of the following compounds would you expect to be the strongest carbon acid?