Linked from
The 62 pages that link to Nucleophilic substitution, each with the reason it gives.
SN2 reactionNarrower topic: SN2 is one of the two principal pathways for nucleophilic substitution.
SN1 reactionNarrower topic: SN1 is one mechanistic pathway within this broader reaction class.
SNi reactionNarrower topic: SNi is one mechanistic pathway within this broader reaction family.
Benzyl chlorideNarrower topic: Nucleophiles displace chloride from its activated benzylic carbon.