Multiple Bonding H. :: or or or H H CC=C Hc- H H 08刘 ethylene formaldehyde formaldimine Sharing two pairs of electrons is called a double bond. Sharing three pairs of electrons is called a triple bond. 2013 Pearson Education,Inc. Chapter 1 13© 2013 Pearson Education, Inc. Multiple Bonding • Sharing two pairs of electrons is called a double bond. • Sharing three pairs of electrons is called a triple bond. Chapter 1 13