question_answer

Which is the most stable carbocation?

A)  iso-propyl

B)  triphenyl methyl cation

C)  Ethyl cation

D)  \[\pi \] propyl cation

Correct Answer: B

Solution :

                 Stability of carbonium ions is in the/ following order. Tertiary alkyl > secondary alkyl                                 > primary alkyl > methyl More the number of alkyl groups, the greater the dispersal of positive charge and therefore, more the stability of carbonium ion.                 Triphenyl methyl cation Dispersal of positive charge increases with increase in number of benzene ring due to resonance, hence it is the most stable carbocation.