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In the following question, a statement of assertion is followed by a statement of reason. Select the correct option
Assertion: Bond dissociation enthalpy decreases from F2 to Cl2 and then increases in Br2 and I2.
Reason: F–F bond is weaker than Cl–Cl.
Both assertion and reason are true and reason is the correct explanation of assertion.
Both assertion and reason are true but reason is not the correct explanation of assertion.
Assertion is true but reason is false.
Both assertion and reason are false.
Answers (1)
Bond dissociation enthalpy increases from F2 to Cl2 and then from chlorine onwards show the expected trend of Cl–Cl> Br–Br> I–I.F–F bond is weaker than Cl–Cl because of the relatively large electron-electron repulsion among lone pairs in F2 molecule where they are much closer to each other than in case of Cl2.
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