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Which of these molecules have non-bonding electron pairs on the cental atom? I : SF ₄ : II : ICl ₃ : III : SO ₂

Options

  1. AI and III only
  2. BI, II and III
  3. CII only
  4. DI and II only

Correct answer

B. I, II and III

Step-by-step solution

For SF ₄ , the central atom is sulfur (group 16). Sulfur has 6 valence electrons. It forms 4 bonds with fluorine atoms, leaving 6 - 4 = 2 electrons, which corresponds to 1 lone pair on the sulfur atom. For ICl ₃ , the central atom is iodine (group 17). Iodine has 7 valence electrons. It forms 3 bonds with chlorine atoms, leaving 7 - 3 = 4 electrons, which corresponds to 2 lone pairs on the iodine atom. For SO ₂ , the central atom is sulfur (group 16). Sulfur has 6 valence electrons. It forms 2 double bonds with oxy

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