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F2 has lower bond dissociation enthalpy ...

`F_2` has lower bond dissociation enthalpy than `Cl_2.` Why?

Text Solution

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Due to smaller size, the lone pairs of electrons on the F-atoms repel the bond pair of the F-F bond. In contrast, because of comparatively large size of CI atoms, the lone pairs on the CI atoms do not repel the bond pair of CI-CI bond. As a rsult, F-F bond energy is lower than that of CI-CI bond energy.
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Knowledge Check

  • Assertion (A): F, has lower bond dissociation energy than Cl_(2) . Reason (R): Flourine is more electronegative than chlorine.

    A
    Both A and R are true and R is the correct explanation of A
    B
    Both A and R are true but R is NOT the correct explanation of A
    C
    A is true but R is false
    D
    A is false and R is True.

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    A
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    B
    `F - F gt Cl - Cl gt Br - Br gt I-I`
    C
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    D
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