Q41 / 180 · AIIMS 2013 · Chemistry

Assertion : Bond dissociation energy is $\mathrm{F}_2>\mathrm{Cl}_2$ Reason : $\mathrm{Cl}_2$ has more electronic repulsion than $\mathrm{F}_2$.

  • A
    If both assertion and reason are true and reason is the correct explanation of assertion.
  • B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C
    If assertion is true but reason is false.
  • Correct answer
    D
    If both assertion and reason are false.

Solution

Bond dissociation energy is $\mathrm{F}_2 < \mathrm{Cl}_2$ because of relatively large electron-electron repulsion among the lone pairs in $\mathrm{F}_2$ molecule where they are much closer to each other than in $\mathrm{Cl}_2$.

Hence, the correct answer is option: 'D'.

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