question_answer

A)

B)

C)

D)  None of these.

Correct Answer: C

Solution :

[c] : The concept is based on thermo- dynamically and kinetically controlled reaction. When the temperature is lower, reaction is irreversible and kinetically controlled. So, due to more polarity of bond, addition takes place across .                             When the temperature is higher, the reaction is reversible and hence thermodynamically controlled. is thermodynamically more stable than . hence, addition takes place across