Benedict’s solution is not reduced by

In the presence of a small amount of phosphorus,aliphatic carboxylic acids react with chlorine or bromine to yield a compound in which $\alpha$-hydrogen has been replaced by a halogen. This reaction is known as:

Identify the reagent used in the following reaction.
Benzoic acid $\xrightarrow{\text{Reagent}}$ Benzoyl chloride $+$ Phosphorus oxychloride $+$ Hydrogen chloride

The reagent that can reduce the carboxylic acid group to the corresponding alcohol is

Which of the following acids will form an $(a)$ anhydride on heating and $(b)$ an acid imide on strong heating with ammonia?

Reaction of acetaldehyde with $HCN$ followed by hydrolysis gives a compound which shows