CUET · CHEMISTRY · PYQ PAPER 2025
Read the passage carefully and answer the questions
Carboxylic acids are the organic compounds which comprise of carboxyl functional group, -COOH. These are generally found in nature, some higher members are known as fatty acids as they occur in natural fats as esters of glycerol. They can be prepared from oxidation of alcohols and aldehydes, hydrolysis of nitriles and amides and Grignard reagents. They are stronger acids than simple phenols and alcohols. but weaker than mineral acids. Substituents affect the acidity of aliphatic and aromatic carboxylic acids. They undergo reactions involving cleavage of -OH and C-OH bond. Carboxylic acids having an alpha hydrogen get halogenated in the presence of red phosphorus to form alpha halo carboxylic acids. The reaction is known as Hell Volhard Zelinsky reaction. Besides these aromatic carboxylic acids undergo electrophilic substitution reactions. They are versatile and are employed in the manufacture of various useful compounds. For example, methanoic acid is used in rubber, textile, dyeing, leather and electroplating industries. Higher fatty acids are used in the manufacture of soaps and detergents. Esters of Benzoic acid are used in perfumery.
Which carboxylic acid will not undergo HVZ reaction?
- A Ethanoic acid
- B Benzoic acid
- C Propanoic acid
- D Phenyl acetic acid
Answer & Solution
Correct Answer
(B) Benzoic acid
Step-by-step Solution
Detailed explanation
Carboxylic acids without alpha hydrogen will not undergo HVZ reaction. Benzoic acid \( (\text{C}_6\text{H}_5\text{COOH}) \) does not have alpha hydrogen.
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