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(B) The stability of a molecule upon anion formation depends on the change in bond order. If the electron enters a bonding molecular orbital,the bond

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$C_2$

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(B) The stability of a molecule upon anion formation depends on the change in bond order. If the electron enters a bonding molecular orbital,the bond order increases,leading to stabilization. If it enters an antibonding orbital,the bond order decreases,leading to destabilization.For $C_2$: The electronic configuration is $\sigma 1s^2 \sigma^* 1s^2 \sigma 2s^2 \sigma^* 2s^2 \pi 2p_y^2 \pi 2p_z^2$. Bond order = $(8-4)/2 = 2$.For $C_2^-$: The configuration is $\sigma 1s^2 \sigma^* 1s^2 \sigma 2s^2 \sigma^* 2s^2 \pi 2p_y^2 \pi 2p_z^2 \sigma 2p_x^1$. Bond order = $(9-4)/2 = 2.5$.Since the bond order increases from $2$ to $2.5$,$C_2$ is stabilized by anion formation.

Among the following,the molecule expected to be stabilized by anion formation is

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