question_answer

Which one of the following pairs undergo \[{{S}_{N}}1\] substitution reaction faster and why? (i)   or (ii)   or  

Answer:

                The reactivity in \[{{S}_{N}}1\] reactions depends upon the stability of the intermediate carbocation which an alkyl halide gives on ionization. (i)               Since \[3{}^\circ \] carbocations are more stable than\[2{}^\circ \] carbocations, therefore,   will react faster than (ii)     Since \[2{}^\circ \] carbocations are more stable than \[1{}^\circ \]carbocations, therefore,  reacts faster than .