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Write down the major product in the following reaction with possible mechanism |
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Answer» Solution :It is an example of Favorsky rearrangement reaction. When `alpha`-halogenocyclohexanone (i.e., six membered RING) is treated with alkali (NaOH) followed by ACIDIFICATION forms cyclopentane carboxylic acid ( a five membred ring carboxylic acid). Mechanism : Base abstracts acidic `alpha`-H atom from `alpha`-haloketone, followed by `S_(N^(2))` DISPLACEMENT of `CL^(-)` to give a bicycloketone. Ring opening followed by acidification gives cyclopentane carboxylic acid. 
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