Which of the following reactions would give the best yield?

Options

A.
B.
C.
D.

Answer

B

Explanation

The product can be formed with best yield if `S_N2` reaction conditions are used, otherwise elimination product is also formed in signif)cant amount. For `S_N2` mechanism, primruy alkyl halides are best suited. Hence, the reaction in option (B) will take place with `S_N2`.
In other options, reaction conditions also initiate elimination reaction, so, a mixture of products is obtained in other cases.