Which of the following halides CANNOT be converted into a stable Grignard reagent by reaction with Mg in dry ether?

A4-bromobutan-2-one, $CH X_{3} COCH X_{2} CH X_{2} Br$
B4-bromobenzoic acid, $p - BrC X_{6} H X_{4} - COOH$
C2-bromoethan-1-ol, $BrCH X_{2} CH X_{2} OH$
Dbromobenzene

Answer: A, B, C

A Grignard reagent is destroyed by acidic hydrogens (OH, COOH) and attacks carbonyl groups. The alcohol and the carboxylic acid supply acidic protons, and the ketone would react with the organomagnesium compound formed in the same molecule or a neighbour. Bromobenzene has no incompatible group and forms

C X_{6} H X_{5} MgBr

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Which of the following halides CANNOT be converted into a stable Grignard reagent by reaction with Mg in dry ether?

Answer: A, B, C

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