(a) C4H10
(b) C5H12
(c) C3H8
(d) C6H14
Solution:
Option (c) is the answer.
Because there must be greater than or equal to 4 carbon atoms for chain isomerism to occur, propane does not display chain isomerism.
In a molecule like propane, no matter how the carbon atoms are arranged, a new structure cannot be produced, i.e. no matter how the carbon atoms are numbered, the total number of carbons will always be three.