Question

Which of the following statement is correct for S_N1 mechanism ? 

(a) The first step is dissociation into an intimate ion pair 

(b) In second step the leaving group attacks from back side 

(c) There is inversion of configuration 

(d) An external nucleophile attacks the substrate

Answer 1

Correct option: (a) The first step is dissociation into an intimate ion pair

S_N1 = Internal nucleophilic substitution reaction In S_N1 mechanism, retention of configuration will be observed. The first step is dissociation into an intimate ion pair.

Product obtain with retention in configuration