Which of the following statements are correct about the reaction intermediate ?

Options

A. intermediate (iii) is unstable because in this carbon is attached to 5 atoms
B. intermediate (iii) is unstable because carbon atom is `sp^(2)` hybridised
C. intermediate (iii) is stable because carbon atom is `sp^(2)` hybridised
D. intermediate (iii) is less stable than the reactant (ii)

Answer

A, D

Explanation

For the given reaction, intermediate (ii) represent transition state, and it is highly unstable. In this transition state, carbon atom is `sp^(2)` hybridised as partially bonded to two nucleophiles so it is highly unstable and less stable than the reactant (ii). Reactant (ii), carbon atom is `sp^(3)` hybridised and more stable than intermediate (iii).