Multiple Bonds

The C and O atoms in molecules like CO₂ and H₂CCH₂ can be understood to obey the octet rule if we assume that two electron pairs are shared, leading to a double bond. Still other molecules like HCCH and HCN require the sharing of three electron pairs, a triple bond.

You Need to Know

A covalent bond between two atoms involves sharing of 1, 2, or 3 electron pairs single, double, or triple bonds.