#"Ethanol"# and #"diethyl ether"# are different molecules..........
Explanation:
We represent ethanol as #"H"_3"CCH"_2"OH"#; ethyl ether is #"H"_3"CCH"_2"OCH"_2"CH"_3#. Ether, has a much lower normal boiling point, #34##""^@C#, than that of ethanol, #78##""^@C#. Can you suggest a reason why?