1. Skeletal Formula CH3CH2CH2CH2CH2CH3
Each straight line represents a bond between atoms.
The corner or end of the line represents a carbon atom unless another atom symbol is written there.
Example: hexane
CH3CH2CH2CH2CH2CH3
Condensed structural formula
3D model of molecule
White atoms are hydrogen
Black atoms are carbon
Skeletal formula

2. Skeletal Formula CH3CH2OH OH
Each straight line represents a bond between atoms.
The corner or end of the line represents a carbon atom unless another atom symbol is written there.
Example: ethanol
CH3CH2OH
Condensed structural formula
3D model of molecule
White atoms are hydrogen
Black atoms are carbon
Red atom is oxygen
Skeletal formula OH

3. Skeletal Formula CH2 = CH – CH2 – CH3 CH2 – CH = CH2 – CH3
Multiple lines can be used to double or triple bonds.
Example: but-1-ene
CH2 = CH – CH2 – CH3
Structural formula
Skeletal formula
Example: but-2-ene
CH2 – CH = CH2 – CH3
Structural formula
Skeletal formula