The structure of the substrate impacts on a nucleophilic substitution reaction; some substrates are better Sₙ2 reactants, others are more suitable as Sₙ1 reactants.
a. Which type(s) of halide will react faster by an Sₙ1 reaction? Explain
b. Which type(s) of halide will react faster by an Sₙ2 reaction? Explain