Question

Which of the following belong to the same homologous series? C3H8, C4H8, C4H6, C3H6

Answer 1

C4H8,C3H6 Are the homologous series

Answer 2

Answer:  

$\mathrm{C}_{4} \mathrm{H}_{8}, \mathrm{C}_{3} \mathrm{H}_{5}$ is the homologous series

Explanation:

'Homologous series' is a series or a group of 'organic compounds', which have a similar structure and differ from each other by a number of $\mathrm{CH}_{2}$ units. These compounds are generally listed in increasing order of their 'atomic weights'.  

Of all the given options, $\mathrm{C} 4 \mathrm{H} 8$ and $\mathrm{C}_{3} \mathrm{H}_{6}$ belong to same homologous series as they both belong to alkene series whose formula is $\mathrm{C}_{\mathrm{n}} \mathrm{H}_{2 \mathrm{n}}$, where n represents the no. of carbon atoms.