Question

Complete the given $S_{N}2$ reactions. The stereochemistry of the product is:

• A. $R,R$
• B. $R,S$
• C. $S,R$
• D. $S,S$

Answer 1

Answer: (B), (C)

The correct options are
B $R,S$
C $S,R$

Epoxide ring is opened to form $3$-methylhex-$4$-yn-$2$-ol. The propyne group and $OH$ group have an anti configuration as it is the result of $S_{N}2$ attack involving inversion of configuration. The product is a mixture of $R,S$ and $S,R$ configurations.