Which of the following statements is incorrec | vedclass

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(C) The molecular orbital configuration of $C_2$ ($12$ electrons) is $\sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2, \pi 2p_x^2 = \pi 2p_y^2$

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Number of $\sigma$ bonds decreases

Vedclass · Answer

(C) The molecular orbital configuration of $C_2$ ($12$ electrons) is $\sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2, \pi 2p_x^2 = \pi 2p_y^2$. It has a bond order of $2$ (consisting of $2 \pi$ bonds).When $C_2$ changes to $C_2^{2-}$ ($14$ electrons),the configuration becomes $\sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2, \pi 2p_x^2 = \pi 2p_y^2, \sigma 2p_z^2$. The bond order increases to $3$ (consisting of $2 \pi$ bonds and $1 \sigma$ bond).Therefore,the number of $\sigma$ bonds increases from $0$ to $1$,and the bond order increases from $2$ to $3$. The statement that 'Bond order increases' is correct,and '$\sigma$ bond increases' is correct. The statement '$\sigma$ bond decreases' is incorrect.

Which of the following statements is incorrect when $C_2$ changes to $C_2^{2-}$?

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