Question

Why secondary carbocation more stable than primary?

Answer 1

Hydrocarbyl groups are electron releasing; a carbocation may be stabilized by such a process.

Explanation:

So, given `RH_2C^+` versus `R_2HC^+`, substitution on the `2""^@` carbon, should serve to stabilize this species. Thus, reactions that proceed thru this intermediate are energetically favoured, and more likely to occur.