# What are alkenes and alkynes?

##### 1 Answer
Aug 8, 2016

Alkenes and alkynes are unsaturated organic molecules.

#### Explanation:

A saturated hydrocarbon has a formula of ${C}_{n} {H}_{2 n + 2}$. Each $\text{2 hydrogens}$ less than this formula corresponds to a degree of unsaturation. A degree of unsaturation corresponds to a double bond (i.e. $C = X$) or a ring junction. Alkenes have ${1}^{\circ}$ degree of unsaturation with respect to the corresponding alkane; and alkynes have ${2}^{\circ}$ of unsaturation (because they have a triple bond).

And in summary, consider the general formulae:

${C}_{n} {H}_{2 n + 2}$ $\text{alkanes}$

${C}_{n} {H}_{2 n}$ $\text{alkenes}$

${C}_{n} {H}_{n}$ $\text{alkynes}$.