$S_{N} 2$ reaction leads to:

inversion of configuration

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retention of configuration

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partial racemisation

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no racemisation

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Solution

The correct option is A inversion of configuration
In $S_{N} 2$ reaction, the nucleophile attacks from the backside of the leaving group. So, the configuration of molecule is inverted. So like, when umbrella is inverted in heavy wind the configuration of molecule gets inverted.

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