Statement I: O – O bond energy is x kJ/mole but O = O energy is greater than 2x kJ/mole.Statement II : Sigma bond is weaker than pi bond.

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Statement I and Statement II are true.

Statement I is true and statement II is false.

Statement I is false and Statement II is true

Statement I and Statement II are false.

answer is C.

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Detailed Solution

General explaination.....O - O single bond enthalpy is x kJ/mole. We know in O = O, One is a singma bond and other is a Pi bond. Pi bond is generally weaker than a sigma bond.So O = O bond enthalpy must be lesser than 2x KJ/mole.but O.....-O..... single bond is extremely weak due to the repulsions between the lone pairs on small oxygen atoms. Thus ,the sum of two O - O single bond enthalpies {2x} is lesser than the O = O double bond enthalpy.I is tureIn general single bond is stronger than pi bond∴ II is false

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