Plot boiling point (BP) (y-axis) versus molecular weight (MW) (x-axis) for the first four compounds listed in the table below.
compound BP © MW
Dimethyl ether -24 46
Carbon disulfide 46 76
n-Hexane 69 86
n-heptane 98 100
water 100 18
Ethanol 80 46
Why Water and Ethanol are not on a straight line like the other substances?