Draw diagrams showing the formation of a double bond and a triple bond between carbon atoms in $C_2H_4$ and $C_2H_2$ molecules.

(N/A) In $C_2H_4$ (Ethene),the carbon atoms undergo $sp^2$ hybridization. One $C-C$ $\sigma$ bond is formed by the overlap of $sp^2$ orbitals,and one $\pi$ bond is formed by the lateral overlap of unhybridized $2p_x$ orbitals.
In $C_2H_2$ (Ethyne),the carbon atoms undergo $sp$ hybridization. One $C-C$ $\sigma$ bond is formed by the overlap of $sp$ orbitals,and two $\pi$ bonds are formed by the lateral overlap of unhybridized $2p_x$ and $2p_y$ orbitals.