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WBCS Main Examination 2023 — Paper IV: General Studies II · Question 136 of 200

Q136
General ScienceChemistry
Which structure has delocalized π electrons?
  1. a.O$_3$
  2. b.Co
  3. c.HCN
  4. d.CO$_2$

Answer: (A) O$_3$

Ozone is a resonance hybrid of two equivalent structures, so its π electrons are spread over all three oxygen atoms (a 3-centre, 4-electron π system), and both O–O bonds are equal. In CO, HCN and CO$_2$ the π bonds are described as localised between particular atoms.

Q135 Whole paperQ137
Which structure has delocalized π electrons? — WBCS Main Examination 2023 Q136 | Prostuti360°