Identifying Sigma and Pi Bonds and Electrons Practice Worksheet Answer Key
Identifying Sigma and Pi Bonds and Electrons Practice Worksheet Answer Key:
For each molecule provided, determine whether each bond is a sigma (σ) bond or a pi (π) bond. Clearly label each bond as sigma or pi directly on the molecular structure.
1. 
The single bond on the left side of the molecule is a sigma bond because all single bonds are always sigma bonds.
The triple bond is made of one sigma bond and two pi bonds. Every bond has 1 sigma bond, however a bond can never have more than 1 sigma bond. That means the second and third bonds in the triple bond must be pi bonds.
2.
Every bond in this structure is a single bond. Therefore, every bond in this structures is a sigma bond because all single bonds are always sigma bonds.
3.
The two single bonds on the ends of the molecule must be sigma bonds because all single bonds are always sigma bonds.
The double bond in the middle of the molecule is made of 1 sigma bond and 1 pi bond. Every bond has 1 sigma bond, however a bond can never have more than 1 sigma bond. That means the second bond in the double bond must be a pi bond.
4.
The two single bonds on the right side of the ring are sigma bonds because all single bonds are always sigma bonds.
The 3 double bonds in the ring are made of 1 sigma bond and 1 pi bond. Every bond has 1 sigma bond, however a bond can never have more than 1 sigma bond. That means the second bond in each double bond must be a pi bond.
5.
The two single bonds on the right side of the ring are sigma bonds because all single bonds are always sigma bonds.
The 2 double bonds in the ring are made of 1 sigma bond and 1 pi bond. Every bond has 1 sigma bond, however a bond can never have more than 1 sigma bond. That means the second bond in each double bond must be a pi bond.
The triple bond in the ring is made of one sigma bond and two pi bonds. Every bond has 1 sigma bond, however a bond can never have more than 1 sigma bond. That means the second and third bonds in the triple bond must be pi bonds.
6.
The 3 single bonds on the ends of the molecule are all sigma bonds because all single bonds are always sigma bonds.
The double bond in the middle of the molecule is made of 1 sigma bond and 1 pi bond. Every bond has 1 sigma bond, however a bond can never have more than 1 sigma bond. That means the second bond in the double bond must be a pi bond.
7.
Every bond in this structure is a single bond. Therefore, every bond in this structures is a sigma bond because all single bonds are always sigma bonds.
8.
All of the single bonds in the molecule are sigma bonds because all single bonds are always sigma bonds.
The double bond on the right side of the molecule is made of 1 sigma bond and 1 pi bond. Every bond has 1 sigma bond, however a bond can never have more than 1 sigma bond. That means the second bond in the double bond must be a pi bond.
The triple bond on the left side of the molecule is made of one sigma bond and two pi bonds. Every bond has 1 sigma bond, however a bond can never have more than 1 sigma bond. That means the second and third bonds in the triple bond must be pi bonds.
9.
All of the single bonds in this molecule are sigma bonds because single bonds are always sigma bonds.
The double bonds in the ring and on the left side of the molecule are made of 1 sigma bond and 1 pi bond. Every bond has 1 sigma bond, however a bond can never have more than 1 sigma bond. That means the second bond in each double bond must be a pi bond.
The triple bond on the right side of the molecule is made of one sigma bond and two pi bonds. Every bond has 1 sigma bond, however a bond can never have more than 1 sigma bond. That means the second and third bonds in the triple bond must be pi bonds.
10.
All of the single bonds in this molecule are sigma bonds because all single bonds are always sigma bonds.
The two double bonds are made of 1 sigma bond and 1 pi bond. Every bond has 1 sigma bond, however a bond can never have more than 1 sigma bond. That means the second bond in each double bond must be a pi bond.