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

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(A) The molecular orbital configuration for $C_2$ ($12$ electrons) is: $\sigma 1s^2, \sigma^* 1s^2, \sigma 2s^2, \sigma^* 2s^2, \pi 2p_x^2 = \pi 2p_y^2$.In $C_2$,the bond order is $\frac{1}{2}(N_b - N_a) = \frac{1}{2}(8 - 4) = 2$.Since the last electrons enter the $\pi 2p$ orbitals,both bonds in $C_2$ are $\pi$-bonds.Therefore,$C_2$ is the molecule that contains only $\pi$-bonds.

Class 11 Chemistry Chemical Bonding and Molecular Structure Molecular orbital theory

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According to $MO$ theory,the molecule which contains only $\pi$-bonds between the atoms is

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$C_2$
B
$N_2$
C
$O_2$
D
$B_2$

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According to $MO$ theory,the molecule which contains only $\pi$-bonds between the atoms is

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