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How can methyl magnesium bromide be converted to propanoic acid?

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in Chemistry – Class 12 by (188k points)
How can methyl magnesium bromide be converted to propanoic acid?

(a) Jones reagent

(b) KMnO4-KOH; heat

(c) H3O^+; heat

(d) CO2-dry ether; H3o^+

This question was posed to me in examination.

My question is from Methods of Carboxylic Acids Preparation in portion Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

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Correct choice is (d) CO2-dry ether; H3o^+

To elaborate: Methyl magnesium bromide (Grignard reagent) on reaction with CO2 forms an addition product containing an additional C carbon atom. This is decomposed in the presence of mineral acid to form propanoic acid.

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