Which of the following functional groups primarily exerts a powerful (electron withdrawing) resonance effect when attached directly to a benzene ring?

Question

Which of the following functional groups primarily exerts a powerful $-M$ (electron withdrawing) resonance effect when attached directly to a benzene ring?

Prashant Kotian · Accepted Answer

Correct answer: C. A group exerts a effect if the atom attached to the conjugated system is bonded to a more electronegative atom via a multiple bond. The nitro group () strongly pulls -electron density out of the ring, leaving partial positive charges at the ortho and para positions.

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