AIIMS 2019 Chemistry Molecular Orbital Theory Assertion Reason Question
Assertion: In vapour state, S₂ molecules show paramagnetic behavior. Reason: S₂ molecules has two paired electrons in the anti-bonding t₂g³ orbitals like O₂.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
The assertion is true because S₂ molecules exhibit paramagnetic behavior due to the presence of unpaired electrons in their molecular orbitals. However, the reason is false; S₂ does not have two paired electrons in the anti-bonding t₂g³ orbitals like O₂; instead, it has two unpaired electrons in the anti-bonding σ* and t₂g orbitals, which contributes to its paramagnetism. Option A is incorrect because the reason does not correctly explain the assertion, while option B is incorrect as it suggests both statements are true with a correct explanation. Option D is incorrect since the assertion is indeed true.
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