1. O₂^+ ion is diamagnetic. 2. The bond orders of O₂^+, O₂, O₂^- and O₂²⁻ are 2.5, 2, 1.5 and 1, respectively. 3. C₂ molecule has four electrons in its two degenerate π molecular orbitals. 4. H₂^+ ion has one electron.

Topic: Molecular orbital theory, bond order, bond length, bond energy· Chemical Bonding and Molecular Structure

Which amongst the following is incorrect statement ?

1. \(O_2^+\) ion is diamagnetic.

2. The bond orders of \(O_2^+, O_2, O_2^-\) and \(O_2^{2-}\) are 2.5, 2, 1.5 and 1, respectively.

3. \(C_2\) molecule has four electrons in its two degenerate \(\pi\) molecular orbitals.

4. \(H_2^+\) ion has one electron.

Doubtly Asked 30 Oct 2026 NEET UG 2022 Practice test neet Save WhatsApp Report

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Answer: 1. \(O_2^+\) ion is diamagnetic.

Key idea: write MO configurations and count unpaired electrons.

\(\mathrm{O_2^+}\) has 15 electrons, with one electron in \(\pi^*2p\). It has one unpaired electron, so it is paramagnetic, not diamagnetic. Statement (1) is incorrect.

(2) Bond orders: 2.5, 2, 1.5, 1. True.
(3) \(\mathrm{C_2}\) has \(\pi2p_x^2\pi2p_y^2\), four electrons in two degenerate \(\pi\) orbitals. True.
(4) \(\mathrm{H_2^+}\) has 2 - 1 = 1 electron. True.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Which amongst the following is incorrect statement ?

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