Question
Which of the following will have a higher boiling point and why? CH3NH2 or CH3OH.
Solution
Molecular mass of methanol is 32g/mol and molecular mass of methylamine is 31g/mol. Since methanol have higher molecular mass thus it have higher boiling point. Also, CH3OH has very strong H-bonding between its molecules. This is due to the greater electronegativity of oxygen atom. Such strong association of molecules leads to rise in the boiling point. CH3NH2 has comparitively lesser H-bonding due to lesser electronegativity of N atom and hence lesser boiling atom.
