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Which of the following transformations involves a reduction in bond energy and a shift in magnetic properties from diamagnetic to paramagnetic?

1. N2 transitioning to N2+
2. O2 transitioning to O2+
3. C2 transitioning to C2+
4. NO transitioning to NO+

Correct answer: N2 transitioning to N2+

Solution

When N2 is ionized to N2+, one electron is removed from a bonding molecular orbital, reducing bond energy. Additionally, the removal of this electron changes the magnetic behavior from diamagnetic (all electrons paired) to paramagnetic (unpaired electron present).

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