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JEE Main202125 Feb 2021Evening ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

The correct order of bond dissociation enthalpy of halogens is:

Options

  1. AF 2 > Cl 2 > Br 2 > I 2
  2. BCl 2 > F 2 > Br 2 > I 2
  3. CI 2 > Br 2 > Cl 2 > F 2
  4. DCl 2 > Br 2 > F 2 > I 2

Correct answer

D. Cl 2 > Br 2 > F 2 > I 2

Step-by-step solution

Correct order of bond dissociation enthalpy of halogens is Cl 2 > Br 2 > F 2 > I 2 . Due to inter electronic repulsions F - F bond becomes weak and easily broken. Bond dissociation energy of halogen family decreases down the group as the size of atom increases.

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