Number of molecules having bond order 2 from the following molecules is ________ $\mathrm{C}_2, \mathrm{O}_2, \mathrm{Be}_2, \mathrm{Li}_2, \mathrm{Ne}_2, \mathrm{~N}_2, \mathrm{He}_2$

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$\begin{aligned} & \mathrm{C}_2 \ & \left(12 \mathrm{e}^{-}ight): \sigma 1 \mathrm{~s}^2, \sigma^* 1 \mathrm{~s}^2, \sigma 2 \mathrm{~s}^2, \sigma^* 2 \mathrm{~s}^2\left[\pi 2 \mathrm{p}_{\mathrm{x}}^2=\pi 2 \mathrm{p}_{\mathrm{y}}^2ight] \ & 	ext { B.O. }=\frac{8-4}{2}=2 \ & \mathrm{O}_2 \ & \left(16 \mathrm{e}^{-}ight): \sigma 1 \mathrm{~s}^2, \sigma^* 1 \mathrm{~s}^2, \sigma 2 \mathrm{~s}^2, \sigma^* 2 \mathrm{~s}^2, \sigma 2 \mathrm{pz}^2 \ & {\left[\pi 2 \mathrm{p}_{\mathrm{x}}^2=\pi 2 \mathrm{p}_{\mathrm{y}}^2ight]\left[\pi * 2 \mathrm{p}_{\mathrm{x}}^1=\pi * 2 \mathrm{p}_{\mathrm{y}}^1ight]} \ & 	ext { B.O. }=\frac{10-6}{2}=2 \ & 	ext { Be }{ }_2 \ & \left(8 \mathrm{e}^{-}ight): \sigma 1 \mathrm{~s}^2, \sigma^* 1 \mathrm{~s}^2, \sigma 2 \mathrm{~s}^2, \sigma^* 2 \mathrm{~s}^2 \ & 	ext { B.O. }=\frac{4-4}{2}=0 \ & \mathrm{Li}_2 \ & \left(6 \mathrm{e}^{-}ight): \sigma 1 \mathrm{~s}^2, \sigma^* 1 \mathrm{~s}^2, \sigma 2 \mathrm{~s}^2\end{aligned}$ $\begin{aligned} & 	ext { B.O. }=\frac{4-2}{2}=1 \ & \mathrm{Ne}_2 \ & \left(20 \mathrm{e}^{-}ight): \sigma 1 \mathrm{~s}^2, \sigma^* 1 \mathrm{~s}^2, \sigma 2 \mathrm{~s}^2, \sigma^* 2 \mathrm{~s}^2, \sigma 2 \mathrm{pz}^2 \ & {\left[\pi 2 \mathrm{p}_{\mathrm{x}}^2=\pi 2 \mathrm{p}_{\mathrm{y}}^2ight]\left[\pi * 2 \mathrm{p}_{\mathrm{x}}^2=\pi^* 2 \mathrm{p}_{\mathrm{y}}^2ight] \sigma^* 2 \mathrm{p}_{\mathrm{z}}^2} \ & 	ext { B.O. }=\frac{10-10}{2}=0 \ & \mathrm{~N}_2 \ & \left(14 \mathrm{e}^{-}ight): \sigma 1 \mathrm{~s}^2, \sigma^* 1 \mathrm{~s}^2, \sigma 2 \mathrm{~s}^2, \sigma^* 2 \mathrm{~s}^2\left[\pi 2 \mathrm{p}_{\mathrm{x}}^2=\pi 2 \mathrm{p}_{\mathrm{y}}^2ight] \sigma 2 \mathrm{p}_{\mathrm{z}}^2 \ & 	ext { B.O. }=\frac{10-4}{2}=6 \ & \mathrm{He}_2 \ & \left(4 \mathrm{e}^{-}ight): \sigma 1 \mathrm{~s}^2, \sigma^* 1 \mathrm{~s}^2 \ & 	ext { B.O. }=\frac{2-2}{2}=0\end{aligned}$

Number of molecules having bond order 2 from the following molecules is ________ \(\mathrm{C}_2,…

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