The curved arrow reaction is shown in the image attached.
What is an SN2 reaction?
In organic chemistry, one kind of nucleophilic substitution reaction is called an SN2 (Substitution Nucleophilic Bimolecular) reaction. A nucleophile attacks a substrate (usually an alkyl halide) in an SN2 reaction, which results in the replacement of one nucleophile with another.
The type of nucleophile, the substrate, and the leaving group are important variables that affect the chance of an SN2 reaction. It is evident from the reaction's arrow movement that SN2 is the mechanism.