Question

Which of the following compounds will give the Hell-Volhard-Zelinsky reaction?

• A. R-CH$_2$-COOH
• B. R$_3$C-CHO
• C. R$_2$CO
• D. H-COOH

Answer 1

The Correct Option is A

As explained in the previous response, the Hell-Volhard-Zelinsky (HVZ) reaction is specific to carboxylic acids that have α-hydrogen atoms.

Let's reiterate the analysis:

• Option 1: R-CH₂-COOH: This is a carboxylic acid with α-hydrogen atoms (the hydrogens on the CH₂ group). Therefore, it will undergo the HVZ reaction.
• Option 2: R₃C-CHO: This is an aldehyde, not a carboxylic acid. The HVZ reaction does not apply to aldehydes.
• Option 3: R₂CO: This is a ketone, not a carboxylic acid. The HVZ reaction does not apply to ketones.
• Option 4: H-COOH: This is formic acid. While it is a carboxylic acid, it lacks α-hydrogen atoms. Therefore, it will not undergo the HVZ reaction.

Therefore, the compound that will give the Hell-Volhard-Zelinsky reaction is R-CH₂-COOH.

The correct answer is:

Option 1: R-CH₂-COOH