C₂H<su

i) C₂H₆O is the molecular formula for two compounds A and B but have different structural formula. This phenomenon is called isomerism.

ii) The structural formula of A (CH₃CH₂OH) is:

The structural formula of B (CH₃—O—CH₃) is:

iii) Structure A

Common name: Ethyl alcohol

IUPAC name: Ethanol

Structure B

Common name: Dimethyl ether

IUPAC name: Methoxymethane

iv) The functional group of A is alcohol

The functional group of B is ether