Question

Which among the following compounds will undergo fastest $S_N2$ reaction?

• A.
• B.
• C.
• D.

Answer 1

Answer: (C)

Answer 2

The $S_N2$ reaction rate depends on steric hindrance. Primary alkyl halides react faster than secondary or tertiary halides:
Rate of $S_N2$ : methyl halide > primary > secondary > tertiary.
Among the given options: