In $S_{N} 2$ reactions the sequence of bond breaking and bond formation is as follows :

bond breaking is followed by formation

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bond formation is followed by breaking

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bond breaking and formation occur simultaneously

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bond breaking and formation take place randomly.

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Solution

The correct option is C bond breaking and formation occur simultaneously
This reaction undergoes transition state where the nucleophiles are attached to the alkyl halides. The nucleophiles attacks the alkyl halide substrate in the backside method thereby inverting the configuration of product. Both these process occurs simultaneously.

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In SN2 reactions the sequence of bond breaking and bond formation is as follows :

In $S_{N} 2$ reactions the sequence of bond breaking and bond formation is as follows :