The reagent which does not give acid chloride on treating with a carboxylic acid is

• A

  $\mathrm{SOCl}_{2}$
• B

  $\mathrm{PCl}_{3}$
• C

  $\mathrm{PCl}_{5}$
• Correct answer
  D

  $\mathrm{Cl}_{2}$

Solution

The reagent, $\mathrm{Cl}_{2}$ does not give acid chloride on heating with carboxylic acids ${ }_{q}^{r y}$ while other reagents give acid chloride.

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