The halomethanes CH3F, CH3Cl, CH3Br, and CH3I have different normal boiling points. Which order correctly ranks them from lowest to highest boiling point at 1 atm?
a) CH3F < CH3Cl < CH3Br < CH3I
b) CH3I < CH3Br < CH3Cl < CH3F
c) CH3Cl < CH3F < CH3Br < CH3I
d) CH3F < CH3Br < CH3Cl < CH3I