Which of the following is least reactive in a nucleophilic substitution reaction? — Haloalkanes and Haloarenes Chemistry Question

💡 Solution & Explanation

$C_6H_5Cl$ (chlorobenzene) is an aryl halide. It is the least reactive towards nucleophilic substitution due to the strong partial double bond character between the chlorine atom and the $sp^2$ hybridized aromatic carbon, arising from resonance.