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NTA Abhyas JEE Main2020ChemistryChemical Bonding and Molecular StructurePractice

Arrange the following bonds according to their average bond energies in descending order. C – Cl , C – Br , C – F , C – I

Options

  1. AC – F > C – Cl > C – Br > C – I
  2. BC – I > C – Br > C – Cl > C – F
  3. CC – Br > C – I > C – Cl > C – F
  4. DC – Cl > C – Br > C – I > C – F

Correct answer

A. C – F > C – Cl > C – Br > C – I

Step-by-step solution

Bond   energy ∝ 1 Bond length As on moving down the group size increases so bond length increases hence bond energy decreases. Bond energy C – F > C – Cl > C – Br > C – I

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