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BITSAT2013Chemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Which of the following is incorrect with respect to property indicated?

Options

  1. AE N : F > Cl > Br
  2. BE.A: Cl > F > Br
  3. COxidising power : F ₂> Cl ₂> Br ₂
  4. DBond energy : F ₂> Cl ₂> Br ₂

Correct answer

D. Bond energy : F ₂> Cl ₂> Br ₂

Step-by-step solution

F ₂ is expected to have highest bond energy but the correct decreasing order is Cl ₂> Br ₂> F ₂ because of fluorine atom has very small size due to which there is a high inter electronic repulsion between two fluorine atoms so the bond between two fluorine gets weaker and need less energy.

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