Question

The $-OH$ group of an alcohol or the $-COOH$ group of a carboxylic acid can be replaced by $-Cl$ using

• A. phosphorus pentachloride
• B. hypochlorous acid
• C. chlorine
• D. hydrochloric acid

Answer 1

Answer: (A)

phosphorus pentachloride

Answer 2

The $- OH$ group of alcohol or the $- COOH$ group of a carboxylic acid is replaced by $- Cl$ using phosphorus penta chloride (ie, $PCl _{5}$ ) $\underset{\text { Alcohol }}{ ROH }+ PCl _{5} \longrightarrow RCl + POCl _{3}+ HCl$ $\underset{\text{Acid}}{RCOOH}+ PCl _{5} \longrightarrow RCOCl + POCl _{3}+ HCl$