Question

Propane and ethane are _______________

Answer 1

Definition for homologues

Homologs are a series of compounds differing by a repetitive unit such as ${\mathrm{CH}}_2$ for alkane.

For example,

Propane and ethane have a formula ${\mathrm{H}}_3\mathrm{C}-{\mathrm{CH}}_2-{\mathrm{CH}}_3\&{\mathrm{H}}_3\mathrm{C}-{\mathrm{CH}}_3$respectively

The general formula for an alkane is${\mathrm{C}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}+2}$, therefore, Ethane has a formula ${\mathrm{C}}_2{\mathrm{H}}_6$ and Propane have a formula ${\mathrm{C}}_3{\mathrm{H}}_8$

Therefore, Propane and ethane are homologs.