Discuss sp hybridization in C2H2 molecule ?
Ethene is represented as:
The molecule is built from H atom (1s1) and carbon atom ( 1s2 2s2 2p1x 2p1y 2p1z)
In valence shell carbon has only two unpaired electrons which are not enough for formation of 4 bonds. Thus in carbon an electron is promoted from 2s orbital to empty 2p orbital to give 4 unpaired electrons.
Carbon is now in its excited state.
In ethane molecule carbon use the 2s electron and two of the 2p electrons to form new three sp2 hybrid orbital .The three sp2 orbitals form sigma bond with two hydrogen atoms and one carbon atom. The unhybridised 2p orbitals of both the carbon form pi bonds.
