Question

find the odd man out Methane Ethane propane butane

Answer 1

ethane because it is fossil fuel

Answer 2

"The odd one among methane, ethane, propane, and butane is butane.

Although all of them are alkanes, there is one basic difference of butane with the other three alkanes, that is, methane, ethane and propane do not have any isomers whereas butane exists in two isomers, namely, n-butane and isobutene.

Since butane has 4 carbon atoms, they can be arranged in different patterns unlike the other three.

"