MCQ
What is the stereochemistry of the SN2 reaction of (R)-2-bromobutane with NaOH?
Chemistry
A Retention of configuration
B Inversion of configuration giving (S)-2-butanol
C Racemization
D No reaction
Explanation

SN2 proceeds with Walden inversion: the nucleophile attacks from the back side of the C-Br bond, inverting the stereochemistry from (R) to (S).