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JEE Main 202125 FebruaryEvening Shift
Exam
JEE Main
Year
2021
Date
25 February
Shift
Evening Shift
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

JEE Main 2021 · 25 February · Evening Shift · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

The correct order of bond dissociation enthalpy of halogens is:

The correct order of bond dissociation enthalpy of halogens is:

Options

  1. AF2>Cl2>Br2>I2{F}_{2} > {Cl}_{2} > {Br}_{2} > {I}_{2}
  2. BCl2>F2>Br2>I2{Cl}_{2} > {F}_{2} > {Br}_{2} > {I}_{2}
  3. CI2>Br2>Cl2>F2{I}_{2} > {Br}_{2} > {Cl}_{2} > {F}_{2}
  4. DCl2>Br2>F2>I2{Cl}_{2} > {Br}_{2} > {F}_{2} > {I}_{2}

Correct answer

D. Cl2>Br2>F2>I2{Cl}_{2} > {Br}_{2} > {F}_{2} > {I}_{2}

Step-by-step solution

Correct order of bond dissociation enthalpy of halogens is Cl2>Br2>F2>I2{Cl}_{2} > {Br}_{2} > {F}_{2} > {I}_{2}.

Due to inter electronic repulsions F−FF - 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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