Dear anurag bhattacharjee,

The positive charge over the Benzene Ring is certainly not stable. This is because, Positive charge is stabilized by adjacent negative charge - such as electron donating groups – and destabilized by adjacent positive charge such as electronegativity(increasing) and increasing s-character of orbitals. (Opposite charges attract, like charges repel). 

Postive charge alone is itself not stable. 

Hope this helped you immensely..!

All the Very Best & Good Luck to you ..!!

Best Regards,

AskIITians Expert,

Godfrey Classic Prince

IIT-M

Please approve my answer if you liked it by clicking on "Yes" given below..!!

The positive charge over the Benzene Ring is certainly not stable. This is because, Positive charge is stabilized by adjacent negative charge - such as electron donating groups – and destabilized by adjacent positive charge such as electronegativity(increasing) and increasing s-character of orbitals. (

The positive charge over benzene ring decreases its stability compared with the original structure.

Though the positive charge on Benzene ring is stabilised by resonance, all the intermediate forms are antiaromatic. As benzene looses its aromaticity positive charge on benzene ring is unstable