The reaction of an ester $RCOOR'$ with an alcohol $R''OH$ in the presence of an acid gives

Oxalic acid reacts with concentrated $H_2SO_4$ to produce a mixture of two gases. When this mixture is passed through caustic potash,one of the gases is absorbed. What substance is formed by the absorption of the gas in caustic potash?

In the preparation of an ester,the commonly used dehydrating agent is

An optically active compound $X$ has molecular formula $C_4H_8O_3$. It evolves $CO_2$ with $NaHCO_3$. $X$ reacts with $LiAlH_4$ to give an achiral compound. $X$ is

The correct order of strengths of the carboxylic acids is:

$A$ key step in the hydrolysis of acetamide in aqueous acid proceeds by nucleophilic addition of