Chemical Bonding And Molecular Structure

$2 p_x$ of $\mathrm{C}_1$ and $2 p_y$ of $\mathrm{C}_2$

$2 p_z$ of $\mathrm{C}_1$ and $2 p_y$ of $\mathrm{C}_2$

$2 p_x$ of $C_1$ and 2 s of $C_2$

$2 p_z$ of $C_1$ and $2 p_z$ of $C_2$