Answer:
3° carbocation > 2° carbocation > 1° carbocation
Step-by-step explanation:
Stability of carbocation -
Carbocation , is an electron deficient species , with 6 electrons ,
being an electron deficient species , the carbocation can be stabilized by any group , which gives electron to the carbocation .
hence ,
comparing the case of of a 3° carbocation and a 2° carbocation .
The 3° carbocation , is more stable , due to the presence of three alkyl groups , which donates the electron density to the electron deficient site of the carbocation , hence , is stable ,
but in case of 2° carbocation , there are only two electron donating , alkyl groups , hence , comparing 3° and 2° carbocation , 3° is more stable .
and ,
In case of 1° carbocation , there is only one electron donating , alkyl groups , hence , it is least stable .
Therefore ,
The order of the stability of the carbocation is -
3° carbocation > 2° carbocation > 1° carbocation