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

Question

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

Tardigrade Admin · Accepted Answer

<img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/chemistry/d9042e453e2a5441acf838605295a313-.png" /> This structure will be of lowest energy due to resonance stabilisation of +ve charge. In all other three structures, the presence of electron-withdrawing NO 2 group will destabilize the +ve charge and hence they will have greater energy.

Q. The electrophile, $E^{+}$ attacks the benzene ring to generate the intermediate $σ$ -complex. Of the following, which $σ$ -complex is of lowest energy?

This structure will be of lowest energy due to resonance stabilisation of $+ v e$ charge. In all other three structures, the presence of electron-withdrawing $N O_{2}$ group will destabilize the $+ v e$ charge and hence they will have greater energy.

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

This structure will be of lowest energy due to resonance stabilisation of +ve charge. In all other three structures, the presence of electron-withdrawing NO2​ group will destabilize the +ve charge and hence they will have greater energy.

Q. The electrophile, $E^{+}$ attacks the benzene ring to generate the intermediate $σ$ -complex. Of the following, which $σ$ -complex is of lowest energy?

This structure will be of lowest energy due to resonance stabilisation of $+ v e$ charge. In all other three structures, the presence of electron-withdrawing $N O_{2}$ group will destabilize the $+ v e$ charge and hence they will have greater energy.