All cycloalkanes larger than cyclopropane exist in a dynamic equilibirium between planar and puckered conformations . If you look from side view, you will realize that both cyclobutane and cyclopentane carbons are somewhat twisted, i.e. they are not in the same plane. Cyclohexane can be twisted into a number of nonplanar conformations, the most stable of which is the so-called chair conformation . In the chair conformation , the bonds leading to hydrogen atoms are arranged in two different geometrical situations, axial bonds and equatorial bonds. There are many other nonplanar conformations of cyclohexane, two of which are twisted-boat conformation and boat conformation .
Butane is used as a fuel in lighters.
Natural gas is primarily methane with small amount of ethane , propane , and butane . Antartic ozone depletion hole is the consequense of haloalkane use.