# What molecules have pi bonds?

Aug 6, 2014

Molecules with double and triple bonds have pi bonds.

Every bond has one sigma bond.

A single bond has one sigma bond and no pi bonds.

A double bond has one sigma bond and one pi bond.

A triple bond has one sigma bond and two pi bonds.

Ethylene has a C=C double bond. It consists of a sigma bond and one pi bond.

Acetylene has a C≡C triple bond. It consists of a sigma bond and two pi bonds.