Identify the species from following that exhibits no bond resonance.

Identify the species from following that exhibits no bond resonance.
  1. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}$
  2. $\mathrm{CH}_3 \mathrm{CH}_2^{(+)}$
  3. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{NO}_2$
  4. $\mathrm{C}_6 \mathrm{H}_6$

Asked in: MHT CET 2021 (23 Sep Shift 1)

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