Sn1 reactions usually proceed with a. equal amounts of inversion and retention at the center undergoing substitution b. slightly more inversion than retention at the center undergoing substitution c. slightly more retention than inversion at the center undergoing substitution d. complete inversion at the center undergoing substitution e. complete retention at the center undergoing substitution

B. slightly more inversion than retention at the center undergoing substitution

Explanation:

SN1 reaction -

In this type of reaction , nucleophilic substitution reaction takes place via formation of an intermediate , carbocation , and thereby giving the substituted product .

In the very first step of the reaction , a stable carbocation is generated , which can have the possibility to give both the products , i.e. , retention , inversion .

But , there is always more of the inversion product rather than retention .

And racemisation is 80 - 95% and the rest 20 - 5% is inversion .