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  4. Assertion: Molecular nitrogen is less reactive than molecular oxygen. Reason: The bond length of N2 is shorter than that of oxygen.

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Q. Assertion : Molecular nitrogen is less reactive than molecular oxygen.
Reason : The bond length of $N_2$ is shorter than that of oxygen.

AIIMSAIIMS 2006Chemical Bonding and Molecular Structure

Solution:

Molecular nitrogen is less reactive than that of oxygen because nitrogen has high dissociation energy in comparison to oxygen so, its reactivity is less. Also bond length of nitrogen is shorter than oxygen because of presence of triple bond between nitrogen atoms. So both are true but not correct explanation.