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Chemistry Question on Aldehydes, Ketones and Carboxylic Acids

Which one of the following is an example of Hell-Volhard-Zelinsky reaction?

A

RCOOH−>[(i)B2H6][(ii)H3O+]RCH2OHRCOOH {->[(i)B_2 H_6][(ii)H_3O^+]} RCH_2OH

B

C

D

RCOOH−>[PCl5]RCOClRCOOH {->[PCl_5]} RCOCl

Answer

Explanation

Solution

When aliphatic carboxylic acids react with bromine in presence of red phosphorus give
α\alpha-halogenated acids. This reaction is known as Hell-Volhard-Zelinsky reaction.
R2CHCOOH−>[(i)Br2/Red P][(ii)H2O]R_2CHCOOH {->[(i)Br_2/Red \,P][(ii)H_2O]} R2−CBr∣−COOHR_2 - \underset{\overset{|}{Br}}{C} - COOH