Which of the following molecules can form hydrogen bonds in its molecules ?         I. CH3I       II. CH3NH2       III. CH3OH

Hydrogen bonding occurs when a hydrogen atom bonded to a highly electronegative atom (such as nitrogen, oxygen, or fluorine) exists in the vicinity of another electronegative atom.

I. CH3I: This molecule contains carbon-hydrogen bonds and carbon-iodine bonds. Neither of these are polar enough to form hydrogen bonds.

II. CH3NH2: This molecule contains a nitrogen atom bonded to a hydrogen atom. Nitrogen is highly electronegative and can form hydrogen bonds.

III. CH3OH: This molecule contains an oxygen atom bonded to a hydrogen atom. Oxygen is highly electronegative and can form hydrogen bonds.

So, the molecules that can form hydrogen bonds are CH3NH2 and CH3OH.