Which of the following statements is incorrec | vedclass

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(D) The electronic configuration of $C_2$ ($12$ electrons) is $KK \sigma(2s)^2 \sigma^*(2s)^2 \pi(2p_x)^2 \pi(2p_y)^2$. The bond order is $(6-2)/2 = 2

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The number of $\pi$ bonds increases

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(D) The electronic configuration of $C_2$ ($12$ electrons) is $KK \sigma(2s)^2 \sigma^*(2s)^2 \pi(2p_x)^2 \pi(2p_y)^2$. The bond order is $(6-2)/2 = 2$,consisting of two $\pi$ bonds.The electronic configuration of $C_2^{2-}$ ($14$ electrons) is $KK \sigma(2s)^2 \sigma^*(2s)^2 \pi(2p_x)^2 \pi(2p_y)^2 \sigma(2p_z)^2$. The bond order is $(8-2)/2 = 3$,consisting of two $\pi$ bonds and one $\sigma$ bond.Comparing the two,the bond order increases from $2$ to $3$,and the number of $\sigma$ bonds increases from $0$ to $1$. However,the number of $\pi$ bonds remains $2$ in both cases. Therefore,the statement that the number of $\pi$ bonds increases is incorrect.

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

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