Chemistry - Halogen Derivative Question with Solution | TestHub

More stable the carbocation, more the tendency to undergo ${\mathrm{S}}_{\mathrm{N}}1$ reaction. Thus, order of carbocation to undergo ${\mathrm{S}}_{\mathrm{N}}1$ reaction is: Benzyl $>$ Allyl $>3^{\circ }>2^{\circ }>1^{\circ }>-{\mathrm{CH}}_3$ Related Theory The rate of reaction depends on the concentration of the substrate in $S_N$ l reaction While In $S_N$, the rate of reaction depends on the concentration of both the substrate and the nucleophile. ! Caution Benzyl carbocation is stabilised by resonance so it will undergo $S_N$ I reaction.