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# The paramagnetism of $O_2$ molecule is believed to be due to the presence of two electrons with parallel spin in

$\begin{array}{1 1}(a)\;bonding\; \pi-orbitals&(b)\; anti-bonding\; \pi-orbitals\\(c)\; bonding\; \sigma-orbitals&(d)\; anti-bonding\; \sigma-orbitals\end{array}$

Can you answer this question?

anti-bonding $\pi-$orbitals
Hence (b) is the correct answer.
answered Dec 9, 2013