Question

given your proposed electron pushing mechanism, list as many factors that could play a role in the success or failure of the reaction:

Answer 1

The factors that play the role in success is solvent, concentration of nucleophile and the substrate.

What is $S_{N}2$ reaction ?

When $sp^{3}$ hybridized  carbon containing a leaving group and nucleophile attack from the remote side of the leaving group then the reaction is known as $S_{N}2$ reaction.

Factors depending on $S_{N}2$ reaction:

1. Solvent: Polar aprotic solvents are very useful for this reaction as they increase the intermediate concentration and also solvate the nucleophile.
2. Nucleophile: More strong the nucleophile  more is the rate of reaction.
3. Substrate:1°  substrate react faster than 2° than 3°

Read more about $S_{N}2$ reaction:

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