The alkyl bromide from which the alkyl acetate shown was made by SN2 reaction is 1-bromo-3-methyl cyclopentane.
SN2 reaction is a synchronous reaction. It is a nucleophilic reaction in which the incoming nucleophile attacks at the same time as the leaving group departs in a single transition state. Good nucleophiles and steric hinderance increase the chances of SN2 substitution.
We can see that the alkyl acetate is formed from the alkyl bromide, 1-bromo-3-methyl cyclopentane. The acetate group replaced the bromide atom in the product.
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