Predict the major product of the following reaction:

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None of the above

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Solution

The correct option is A
Neighbouring group participation takes place. Lone pair on the oxygen from carbonyl group in $- O C O C H_{3}$ attacks . Here the leaving group is $O T s^{-}$
Backside attack of $C H_{3} C O O H$ takes place and the retention of configuration takes place in the product formed because of neighbouring group participation.
The reaction taking place is:

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