Which of the following is paramagnetic with bond order 0.5?

F_{2}

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H_{2}^{+}

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N_{2}

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O_{2}^{-}

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Solution

The correct option is B $H_{2}^{+}$
$H_{2}^{+} = σ 1 s^{1}$ ( According to molecular orbital theory)
Bond order $= \frac{bonding electrons - antibonding electrons}{2}$
$= \frac{1 - 0}{2} = 0.5$
$H_{2}^{+}$ is paramagnetic due to the presence of one unpaired electron.

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