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 
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