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adityaraj

what is the order of stability and reactivity of carbocation?

ApoorvKhatreja

Dude, how many times will you post the same question?

Benzylic >~ Allylic > 3 degree > 2 degree > 1 degree > Methyl > Vinylic.

CHAMP007

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adityaraj

what i want to know is, when a reaction takes place 3>2>1 is the stability order and hence priority of attacking wud be followed acc. to the stability but what is the reactivity order of those carbocation?

sailesh_07

dude, order of reactivity is opposite to the order of stability
1>2>3...etc....

magiclko

carbocations are stable only if the +ve charge on C is well stabilised... more the no of alkyl groups attached to the charge bearing carbon, more will be the +ve charge stabilised, due to electron-donating tendency of alkyl groups.... thus the stability order is given by 3>2>1

now as the charge on a carbocation is well dispersed, it will have less tendency to react with any species .... so the reactivity order is 1>2>3

just rem'ber, the more stable a species is, the less reactive it is!!!

prabhasbajaj

Dude, here's the correct answer-

Carbocations are highly unstable as they're charged species
Comparitive Stability of Carbocation - 3 degree>2 degree>1 degree

Comparing d reactivities of carbocations has no practical sense since all carbocations are very very reactive and there's a very small difference between the reactivities of 1, 2, n 3 degree

A reaction in which 3 degree carbocation is formed is faster since the Transition state(carbocation state) is more stable than other carbos n is thus reached quickly and after that the reaction proceeds with speed (naturally, since carbocations are highly unstable). So, Reactivity of compounds is in the order-
3 degree>2 degree>1 degree

Note- This is true in most cases, exception may occur due to external compensation (eg: SN2 reaction)

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