Write the general formulae of alkanes, alkenes and alkynes.

Part 1: Alkanes

1. Alkanes are saturated hydrocarbons in which there is only a single bond between the Carbon atoms and Carbon and Hydrogen atoms.
2. The general formula of an alkane is ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}+2}$, where, n is the number of carbon atoms.

Part 2: Alkenes

1. A hydrocarbon in which two carbon atoms are bonded by a double bond is called alkenes.
2. The general formula of alkene is${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}}$, where, n is the number of carbon atoms.

Part 3: Alkynes

1. A saturated hydrocarbon in which two carbon atoms are bonded by a triple bond is called alkynes.
2. The general formula of the alkyne is ${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}-2}$, where, n is the number of carbon atoms.