# How can you identify cycloalkanes?

A linear alkane has a formula of ${C}_{n} {H}_{2 n + 2}$. When the alkane is a ring, 2 LESS hydrogens are necessary because of the $C - C$ ring junction. This so-called degree of unsaturation corresponds to a RING or a double bond. When you consider a formula, the degree of unsaturation should be one of the first parameters noted.
By way of example, compare hexane, ${C}_{6} {H}_{14}$, to cyclohexane, ${C}_{6} {H}_{12}$. The ring junction reduces the hydrogen count.