Question

Which of the following will form 2º carbocation?
​

Answer 1

Answer:

Explanation:

nothing will form 2 degree carbocation

Answer 2

2° carbocation will be formed by option D.

A) In A, H+ will attack alkene at ortho position according to Markovnikov rule such that 3° carbocation is formed as it is more stable.

B) In B, H+ will again attack alkene according to Markovnikov rule, on less substituted carbon so that 3° carbocation is formed.

C) C is a simple Markovnikov addition again.

D) In D,

• H+ can attack double bond of alkene or Nitrogen of primary amine.

• Here H+ will attack alkene such that carbocation is formed on carbon attached to nitrogen.

• Since, Nitrogen has a lone pair and a carbocation is present at adjacent carbon it will show resonance.

• So, in this case because of resonance, 2° Carbocation will be formed instead of 3° carbocation.