Question
Question: In the reaction:  is the correct answer.
Additional information:
A nucleophile donates electrons in a pair which will be exposed to different kinds of nucleophiles and negatively charged. In SN2 reaction, nucleophile addition and the leaving group occur in taking place in a single step. Nucleophile approaches the carbon atom which the leaving group is attached to.
Note: Nucleophile involves rate determining step of SN2 reaction which reacts faster. Here we must remember that nucleophiles attack in the reactant and form the product. Here nucleophiles increase nucleophilicity. In this reaction we see that interconversion of functional groups. Here second order kinetics followed by SN2 reactions. The group in this reaction which displaced from the carbon known as leaving group and where the substitution takes place in the molecule known as subtracts.