Question

63. Which of the following nucleophilic substitutions is practically not possible ?
он
Н,0
Br
(а)
+ Br
ОН
ОН
он
(b)
но
Br
(d) None of these
(c) Both (a) and (b)
indide

Answer 1

Answer:

Since S

N

2 or S

N

1 both are not possible for sp

2

−carbon halide. Due to unstability of carbocation on sp

2

centre, it is not favourable at sp

2

− carbon.

Thus nucleophilic substitution reaction given in option A is not possible.