How do I begin to solve this problem?

Question

A compound with the formula C2H6O2 has a boiling point of 198 C. From the data below, deduce its Lewis structure.

CH4 -182 C
CH3CH3 -89 C
CH3CH2CH3 -42 C
CH3OH 65 C
CH3CH2OH 78.5 C
CH3CH2CH2OH 97 C
CH3CH2OCH2CH3 34.5 C

Answer 1

Actually you don't need the boiling point information. In organic chemistry, there is only one compound that has the empiric formula given. That is unless you wish to violate all sorts of rules.

CH2OH-CH2OH

Carbon needs 4 bounds each
Oxygen needs 2 bonds each
Hydrogen needs one bond each.

Answer 2

if i knew i would tell you but i have no clue