The electrophile, E+ attacks the benzene ring to generate the intermediate a-complex. Of the following, which PQSR -complex is of lowest energy?

Question

The electrophile, E+ attacks the benzene ring to generate the intermediate a-complex. Of the following, which P>Q>S>R -complex is of lowest energy? (A)  (B)  (C)  (D)

Tardigrade Admin · Accepted Answer

This structure will be of lowest energy because of resonance stabilisation of positive charge. In all other three structures, the presence of electron-withdrawing 100mL group will destabilise the positive charge and so, they will have greater energy.

Q. The electrophile, E+ attacks the benzene ring to generate the intermediate a-complex. Of the following, which $P > Q > S > R$ -complex is of lowest energy?

This structure will be of lowest energy because of resonance stabilisation of positive charge. In all other three structures, the presence of electron-withdrawing $100 m L$ group will destabilise the positive charge and so, they will have greater energy.

Q. The electrophile, E+ attacks the benzene ring to generate the intermediate a-complex. Of the following, which P>Q>S>R -complex is of lowest energy?

This structure will be of lowest energy because of resonance stabilisation of positive charge. In all other three structures, the presence of electron-withdrawing 100mL group will destabilise the positive charge and so, they will have greater energy.

Q. The electrophile, E+ attacks the benzene ring to generate the intermediate a-complex. Of the following, which $P > Q > S > R$ -complex is of lowest energy?

This structure will be of lowest energy because of resonance stabilisation of positive charge. In all other three structures, the presence of electron-withdrawing $100 m L$ group will destabilise the positive charge and so, they will have greater energy.