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COMEDK202510 May 2025Morning ShiftChemistryChemical Bonding and Molecular StructureActual

From the given covalent compounds (A to F) identify the pair of molecules which have: (i) Two lone pairs of electrons on the central atom. (ii) One lone pair of electrons on the central atom. A. SO ₂ B. ClF ₃ C. BF ₃ D. BrF ₅ E. XeF ₄ F. SF ₆

Options

  1. A(i) A & F (ii) A & E
  2. B(i) C & ~A (ii) B & C
  3. C(i) B & E (ii) A & D
  4. D(i) D & ~F (ii) C & D

Correct answer

C. (i) B & E (ii) A & D

Step-by-step solution

The number of lone pairs on the central atom is determined by the formula: Lone pairs = 1 2 (V - N - C) , where V is the number of valence electrons of the central atom, N is the number of monovalent atoms bonded to it, and C is the charge on the molecule. A. SO ₂ : V=6 , N=0 (oxygen is divalent). Lone pairs = 1 2 (6 - 0) = 3 (considering bonding electrons). More accurately, S has 6 valence electrons, 2 are used for double bonds with each O, leaving 1 lone pair. B. ClF ₃ : V=7 , N=3 . Lone pairs = 1 2 (7 - 3) = 2 .

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