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MHT CET20255 May 2025Evening ShiftChemistryChemical Bonding and Molecular StructureActual

Which of the following molecules does not obey octet rule?

Options

  1. ACO ₂
  2. BCHCl ₃
  3. CClF ₃
  4. DNH ₃

Correct answer

C. ClF ₃

Step-by-step solution

The octet rule analysis proceeds by assessing the Lewis structure of each molecule, focusing on the central atom's electron count. C O₂ : The predicted structure is O=C=O. Carbon shares four bonds with oxygen, each oxygen retains two lone pairs, so oxygen has 2 + 3 2 = 8 electrons and carbon has 4 2 = 8 electrons—satisfying the octet rule. CHCl₃ : Carbon forms single bonds with hydrogen and three chlorine atoms. Hydrogen has 2 electrons from its bond, each chlorine has 1 2 + 3 2 = 8 electrons, and carbon has 4 2 =

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