Polarity of Propan-1-ol and Propan-2-ol

  • Thread starter Thread starter organicchemistryyayy
  • Start date Start date
  • Tags Tags
    Polarity
AI Thread Summary
Propan-1-ol is considered more polar due to its electron distribution, with electrons drawn towards the end of the molecule, while propan-2-ol has a more centralized electron distribution. Despite this reasoning, the dipole moments reveal that propan-1-ol has a dipole moment of 1.487022 debye, whereas propan-2-ol has a slightly higher dipole moment of 1.555496 debye. The small difference in dipole moments suggests that a thorough analysis of the electronic structures of both molecules is necessary for a deeper understanding. The primary contribution to the dipole moment arises from the charge separation in the O-H bond, indicating that the hydrocarbon chain's influence is minimal in comparison. Additionally, differing experimental values from CCCBDB highlight the complexity of measuring these properties accurately.
organicchemistryyayy
Messages
1
Reaction score
0
TL;DR Summary
Dipole moment of propan-2-ol is higher but based on the molecular structure, I think propan-2-ol should be less polar.
Based on the two structures, I think Propan-1-ol is more polar because the electrons are drawn to the end of the molecule while propan-2-ol has electrons drawn to the center of the molecule (less of an unequal electron distribution in the molecule). However when looking at the dipole moment I see that propan-1-ol has a dipole moment of 1.487022 debye while propan-2-ol has a dipole moment of 1.555496. Can someone explain this to me.
 
Chemistry news on Phys.org
With such a tiny difference in dipole moments, the answer is going to come down to a detailed examination of the electronic structures of the two molecules. (Not sure where you got the values from; CCCBDB gives slightly different experimental values—1.55D and 1.58D) The lion’s share of the dipole moment will come from the charge separation in the O-H bond, and the hydrocarbon chain is a relatively small perturbation on that.
 
It seems like a simple enough question: what is the solubility of epsom salt in water at 20°C? A graph or table showing how it varies with temperature would be a bonus. But upon searching the internet I have been unable to determine this with confidence. Wikipedia gives the value of 113g/100ml. But other sources disagree and I can't find a definitive source for the information. I even asked chatgpt but it couldn't be sure either. I thought, naively, that this would be easy to look up without...
I was introduced to the Octet Rule recently and make me wonder, why does 8 valence electrons or a full p orbital always make an element inert? What is so special with a full p orbital? Like take Calcium for an example, its outer orbital is filled but its only the s orbital thats filled so its still reactive not so much as the Alkaline metals but still pretty reactive. Can someone explain it to me? Thanks!!
Back
Top