Which of the following species is not paramag | vedclass

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(B) Paramagnetism is due to the presence of unpaired electrons. $1.$ $NO$: Total electrons = $15$. It has an odd number of electrons,so it must have a

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$CO$

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(B) Paramagnetism is due to the presence of unpaired electrons. $1.$ $NO$: Total electrons = $15$. It has an odd number of electrons,so it must have at least one unpaired electron,making it paramagnetic. $2.$ $CO$: Total electrons = $14$. All electrons are paired in its molecular orbitals,so it is diamagnetic (not paramagnetic). $3.$ $O_2$: Total electrons = $16$. According to Molecular Orbital $(MO)$ theory,it has two unpaired electrons in its antibonding $\pi^* 2p_x$ and $\pi^* 2p_y$ orbitals,so it is paramagnetic. $4.$ $B_2$: Total electrons = $10$. It has two unpaired electrons in its $\pi 2p_x$ and $\pi 2p_y$ orbitals,so it is paramagnetic.

Which of the following species is not paramagnetic?

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