Question

Identify the molecule listed below that cannot form Hydrogen bonds with an identical molecule.

H2O
NH3
BH3
CH3OH

Answer 1

In order to H-bond, a molecule MUST HAVE a lone-pair of electrons on a central atom and be able to attract a neighboring hydrogen that itself is held with a very polar bond. You should draw some lewis structures

Answer 2

CH3OH?

Answer 3

In order to form a H-bond you must have a hydrogen attached to a highly electronegative element (N, O and F)

Answer 4

Look up the options, which one do you think doesn't have a hydrogen attached to any of the electron hogs (highly EN elements; N, O, F)

Answer 5

I agree with @Abhisar
so, I guess it should be BH3 right guys?

Answer 6

H bonds are formed between a hydrogen atom and an electronegative atom.
F>O>N>Cl <---This is the decreasing order of the electronegativity of the main electronegative atoms.
Since Boron is more in to electropostitve side rather than electronegativity side we can for BH3. :)

Answer 7

For hyrogen bonding to occur you need to have either F,O, or N covalently bonded to a hydrogen to act as the hydrogen bond donor, AND a lone pair of electrons to act as a hydrogen bond acceptor.