Which of the following statements are correct about this reaction?

Options

A. The given reaction follows `S_(N)2` mechanism
B. (ii) and (iv) have opposite configuration
C. (ii) and (iv) have same configuration
D. The given reaction follows `S_(N)1` mechanism

Answer

A, B

Explanation

In the given reaction, alkyl halide is primary in nature. Here, a transitory state is observed in which one bond is broken and one bond is formed synchronously i.e., in one step. So, it follows `S_(N)2` mechanism.
In this mechanism, nucleophile attacks the carbon at `180^(@)` to the leaving group, so the reactant and product have opposite configuration.