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Two methods have been adopted to prepare...

Two methods have been adopted to prepare 2-methylbutanoic acid from butan-2-01. Which path is better ?

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`CN^(-)` ion used in the first path is a very strong nucleophile. It can cause the elimination of secondary alkyl chloride (A) to give alkene as the side product. Therefore, the second path involving a Grignard's reagent better.
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