The common formula of alkane is . . . . . . . .

Answer: Option C

The general formula for alkanes is C_nH_{2n + 2}.

Alkanes are the simplest type of hydrocarbons and are also known as saturated hydrocarbons.

In this formula, "n" represents the number of carbon atoms in the molecule.

The formula indicates that for every "n" carbon atoms, there are "2n + 2" hydrogen atoms.

This formula applies to all alkanes, regardless of the number of carbon atoms present in the molecule.