The preferred reagent for the following conversion is $$ \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COOH} \rightarrow \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{COCl} $$

• A

  $\mathrm{HCl}$
• B

  $\mathrm{HOCl}$
• Correct answer
  C

  $\mathrm{SOCl}_2$
• D

  $\mathrm{NaOCl}$

Solution

A carboxylic acid can be converted into its functional derivative ; acyl halide by use of thionyl chloride $\mathrm{SOCl}_2$.
This reaction is a nucleophilic acyl substitution with $\mathrm{SOCl}_2$ acting as a good nucleophilic reagent.

Hence, the correct answer is option: 'C'.