Discuss `sp^2` hybridisation in ethene `(C_(2)H_(4))` molecule.

Explanation

In ethyne molecule,carbon atoms undergo sp hybridation. Ethyne has two unhybridised `pi` orbitals, i.e, `2p_x` and `2p_y`. One sp hybrid orbital of one carbon atom overlaps axially with sp hybridisation orbital of the other carbon atom to form C-C sigma bond. The second hybrid orbital of each C atom overlaps with the half filled is orbital of hydrogen atoms forming `sigma` bonds. Each unhybridised p orbital of C atoms overlaps sidewise to form `pi` bonds between the C atoms.