KCET 2017 Chemistry Solved Paper

Option (1): n-Butane and iso-butane are position isomers as only position of carbon is changed.
Option (2): Dimethyl ether and ethanol are functional isomers as ether and alcohol are different functional groups.
Option (3): Propan-l-ol and propan-2-ol are position isomers as only position of alcohol is changed.
Option (4): Ethanoic acid and methyl methanoate are functional isomers as ester and acid are different functional groups.