Question

Why Isomers of first three alkanes are not possible

Answer 1

good morning mate here is u r answer hope it will help u plzzzzz mark brainlist it u think that it is good

Answer 2

First Alkane-Methane single carbon atom therefore no bonding available
second Alkane-Ethane only two carbon atoms therefore only single chain possible (No branching)
third alkane-propane only three carbon atoms therefore branching is chain and no carbon can be extended our to show isomerism.
hope it helps. hi