Identify number of nucleophilic substitution reactions in the given reactions?

Step-by-step solution

Use the concept explained below on each of the reaction to identify the nucleophilic substitution reaction: In a nucleophilic substitution reaction, the leaving group (nucleophile) is replaced by an electron rich compound (nucleophile). The whole molecular entity of which the electrophile and the leaving group are part is usually called the substrate. The nucleophile essentially attempts to replace the leaving group as the primary substituent in the reaction itself, as a part of another molecule. Nuc: + R-LG → R-Nu