Question

Which is incorrect statement regarding the above reaction?

• A. Stereochemically configuration of product is retained
• B. Reaction goes through $S_{N}1$ pathway
• C. Internal attck of nucleophile takes place
• D. Addition of pyridine drives the configuration from retention to inversion

Answer 1

The correct option is B Reaction goes through $S_{N}1$ pathway

Reaction goes through $S_{N}i$ pathway. Due to internal attack of $Cl$, configuration is retained
Addition of pyridine produces free nucleophile which enables back side attack $\left(S_{N}2\right)$. Hence inversion take place.