Question

write sn¹ and sn² reaction briefly​

Answer 1

Answer:

The SN2 reaction is a type of reaction mechanism that is common in organic chemistry. In this mechanism, one bond is broken and one bond is formed synchronously, i.e., in one step. SN2 is a kind of nucleophilic substitution reaction mechanism, the name referring to the Hughes-Ingold symbol of the mechanism. Since two reacting species are involved in the slow (rate-determining) step, this leads to the term substitution nucleophilic (bi-molecular) or SN2; the other major kind is SN1.[1] Many other more specialized mechanisms describe substitution reactions.

Ball-and-stick representation of the SN2 reaction of CH3SH with CH3I yielding dimethylsulfonium

Structure of the SN2 transition state

The reaction type is so common that it has other names, e.g. "bimolecular nucleophilic substitution", or, among inorganic chemists, "associative substitution" or "interchange mechanism".