In the reaction
`underset("1-Chlorobut-2-ene")(CH_(3)CH=CH-CH_(2)Cl)overset(CN^(-))rarr`
the organic product/product formed are

Options

A. `CH_(3)CH=CH-CH_(2)CN`
B. `CH_(3)CH(CN)CH=CH_(2)`
C. Both A and B
D. None of these

Answer

C

Explanation

Formation of product (A) is due to `S_(N^(2))` reaction at the terminal C.

Formation of product (B) is due to the attack of `CN^(-)` on C-3 with the `pi`-electrons of double bond acting as nucleophile to displace `Cl^(-)` is an alylic rearrangement (an `S_(N^(2))` reaction).