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P Block Elements question

2016 · Q96
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P Block Elements question

2016 · Q96

NEETChemistryP Block ElementsMCQ+4 / −1
Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?
  1. A
    Br2 > I2 > F2 > Cl2
  2. B
    F2 > Cl2 > Br2 > I2
  3. C
    I2 > Br2 > Cl2 > F2
  4. D
    Cl2 > Br2 > F2 > I2
View written solutionFree

Correct answer: D

Bond dissociation enthalpy decreases as the bond distance increases from F2 to I2. This is due to increase in the size of the atom, on moving from F to I.

F – F bond dissociation enthalpy is smaller then Cl – Cl and even smaller than Br – Br. This is because F atom is very small and hence the three lone pairs of electrons on each F atom repel the bond pair holding the F-atoms in F2 molecules.

The order of bond dissociation enthalpy is :

Cl2 > Br2 > F2 > I2

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