sp2 hybridisation structure of C2H4????
In ethene C2H4, each carbon uses its 2s and two 2p orbitals for hybridization resulting three sp2 hybrid orbitals. The third 2p orbital remains unhybridized.
Following fig shows the how double bond occurs
Step 1- Atomic orbitals of C-atom in ground state
Step 2- Atomic orbitals of C-atom in excited state
Step 3- sp2 hybridization in C-atom with three sp2hybride orbitals and one p unhybrid orbital
Step 4- The three sp2 orbitals are shared by one C and two H atoms to give ethene molecule having C-C double bonds (one sigma and one pie)