AIIMS2019Chemistry-Chemical Bonding

AIIMS 2019 Chemistry Molecular Orbital Theory Assertion Reason Question

Type: Assertion Reason-conceptual-Medium-Class 11

Assertion: In vapour state, S₂ molecules show paramagnetic behavior. Reason: S₂ molecules has two paired electrons in the anti-bonding t₂g³ orbitals like O₂.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason is not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Correct Answer

Option C

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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