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MHT CET202525 Apr 2025Evening ShiftChemistryChemical Bonding and Molecular StructureActual

Which of the following pair of compounds consists equal number of lone pair of electrons in the valence shell of central atom?

Options

  1. ABrF ₅ and XeF ₆
  2. BICl and H ₂ ~S
  3. CClF ₃ and XeF ₂
  4. DIF ₇ and XeF ₄

Correct answer

A. BrF ₅ and XeF ₆

Step-by-step solution

Determining lone pairs on central atoms requires analyzing valence electrons and bonding structure. Compounds with analogous electron domains exhibit equal lone pair counts when their bonding patterns yield identical remaining electron pairs. BrF ₅ and XeF ₆ : Bromine (Group 17) has 7 valence electrons; bonding to 5 fluorine atoms uses 5 electrons, leaving 2 (1 lone pair). Xenon (Group 18) has 8 valence electrons; bonding to 6 fluorine atoms uses 6 electrons, leaving 2 (1 lone pair). Both thus have one lone pair. I

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