1. Tardigrade
  2. Question
  3. Chemistry
  4. 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?

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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?

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Solution:

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.

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