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Chemistry Question on Aldehydes, Ketones and Carboxylic Acids

Which of the following gives Hell-Volhard-Zelinsky (HVZ)(HVZ) reaction?

A

CH3CHOCH_3CHO

B

HCHOHCHO

C

CH3COOHCH_3COOH

D

CH3COCH3CH_3COCH_3

Answer

CH3COOHCH_3COOH

Explanation

Solution

Carboxylic acids having α−H\alpha-H atom undergo Hell-Volhard-Zelinsky reaction. CH3COOHAcetic acid−>[Cl2,Red p][−HCl]ClCH2COOH\underset{\text{Acetic acid}}{{CH_{3}COOH}} { ->[{Cl_{2}, Red \,p}][{-HCl}] }ClCH_{2}COOH −>[Cl2,Red p][−HCl]Cl2CHCOOH−>[Cl2,Red P][−HCl]Cl3CCOOHTrichloroacetic acid { ->[{Cl_{2}, Red\,p}][{-HCl}] } Cl_{2}CHCOOH { ->[{Cl_{2}, Red\, P}][{-HCl}] } \underset{\text{Trichloroacetic acid}}{{Cl_{3}CCOOH}}