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3-Chlorophenyl magnesium bromide on reaction with dry ice followed by acidification in mineral acid gives _________

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3-Chlorophenyl magnesium bromide on reaction with dry ice followed by acidification in mineral acid gives _________

(a) 3-Chlorophenol

(b) 3-Chlorophenylethanoic acid

(c) 3-Chlorobenzaldehyde

(d) 3-Chlorobenzoic acid

I had been asked this question during an interview.

This interesting question is from Methods of Carboxylic Acids Preparation topic in chapter Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

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Correct choice is (d) 3-Chlorobenzoic acid

To explain I would say: The MgBr group of 3-Chlorophenyl magnesium bromide (Grignard reagent) will be substituted by COOH group in the above reaction, to give a halogen substituted aromatic carboxylic acid.

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