Question

Which of the following figures represent correctly the structure of transition state in this reaction?

• A.
• B.
• C. Either (A) or (B) depending upon situation
• D. None of these

Answer 1

The correct option is A

Mechanism of $S_{N}2$ reaction

Pentavalent unstable transition state forms in which nucleophile is forming bond with carbon while leaving group is breaking its bond simultaneously. this is known as Concerted
process.