Lena772
  • Lena772
Identify the molecule listed below that cannot form Hydrogen bonds with an identical molecule. H2O NH3 BH3 CH3OH
Chemistry
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SOLVED
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katieb
  • katieb
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JFraser
  • JFraser
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
Lena772
  • Lena772
CH3OH?
Abhisar
  • Abhisar
In order to form a H-bond you must have a hydrogen attached to a highly electronegative element (N, O and F)

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Abhisar
  • Abhisar
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)
arindameducationusc
  • arindameducationusc
I agree with @Abhisar so, I guess it should be BH3 right guys?
Rushwr
  • Rushwr
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. :)
Photon336
  • Photon336
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.
Photon336
  • Photon336
|dw:1439841956985:dw||dw:1439842041594:dw| |dw:1439842098512:dw|
Photon336
  • Photon336
We can see from these elements here, that in order to hydrogen bond there also must be a lone pair of electrons available to act as an acceptor as you see, so both requirements must be met for this to happen.
Photon336
  • Photon336
Boron is electron deficient, so it has no lone pairs that can participate in H bonding with another BH3 molecule, and also it's not that highly of an electronegative element to do so anyway. |dw:1439842257647:dw| @lLena772
Photon336
  • Photon336
@Lena772
arindameducationusc
  • arindameducationusc
nice one @Photon336
Photon336
  • Photon336
Thanks @arindameducationusc the pictures are a little messy but hey i think I got the point across lol

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