Question

Explain the reaction mechanism of SN1 and SN2 reactions. Write equations to prepare the following compounds from ethyl bromide?
* C2H5SH * C2H5O C2H5 * C2H5CN​

Answer 1

Answer:

SN1 -

1. Unimolecular NSR
2. It is two step mechanism
3. step (1) is reversible, slow and rate determining.
4. intermediate is carbocation so rearrangement, expansion also possible.
5. step (2) is faster one because cation has incomplete octate so have strong tendency to accept electron pair from nucleophile.

SN2 -

1. Bimolecular nucleophilic reaction
2. It is single step mechanism
3. attack of nucleophile and leaving of LG is simultaneously occur.
4. No cation, no rearrangement.
5. Transition state is form.
6. It is second order kinetics.

Explanation:

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