Which is most stable carbocation?

Options

A. Iso-propyl
B. Triphenylmethyl cation
C. Ethyl cation
D. `pi`- propyl cation

Answer

B

Explanation

Stability of carbonium ions. `Ph_(3)overset(+)(C) gt Ph_(2) overset(+)(C)H gt Phoverset(+)(C)H_(2)` tertiary alkyl `gt` secondary alkyl `gt` primary alkyl `gt` methyl. More the number of phenyl groups, the greater the dispersal of positive charge and therefore, more the stability of carbonium ion is observed.

Dispersal of positive charge increases with the increase in the number of benzene ring.