Which of the following molecules can form hydrogen bonds?

CH4
NaH
NH3
BH3
HI

Answer:
CH4 - No, the H is not covalently bonded to a small electronegative atom
NaH - No, this is not a molecule, it is a giant ionic structure containing Na+ and H-, so the H is not covalently bonded to anything!
NH3 - Yes, the H is bonded to a small electronegative atom (N) and you get N-H.N hydrogen bonds
BH3 - No, B is not electronegative enough to make the H atom sufficiently positive for H-bonding
HI - No, nor is I sufficiently electronegative
NH3 for sure lone pair and polar,
CH4 is nonpolar,
NaH is ionic so will dissociate in aqueous environments
BH3, i don't think that B is electronegative enough
HI, ionic
HI NH3

The only elements that can form h-bonds are Oxygen Nitrogen Fluorine Iodine and a few others.

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