Organic Chemistry Help....

[delano2000]

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I have 2 questions on my Orgo homework that I can't figure out.


1. Determine the partial negative charge on the fluorine atom in a C-F bond. Bond length = 1.39 angstrom, bond dipole moment is 1.60 D.

2. What orbitals are used to form the 10 covalent bonds in propane?


Any help is appreciated.😀

 

[pharm B]

I might be off on this, but the propane carbons are all sp3 hybridized. So all of the bonds are p-orbital.

 

[hornblower]

What text are you using? Is this Organic I or II?

I am in my first week of Organic I and so far we have only had to determine the charge's direction, not the actual value.

 

[delano2000]

I might be off on this, but the propane carbons are all sp3 hybridized. So all of the bonds are p-orbital.

This sounds like Chinese.

If I am not mistaken, my professor said they are mostly s-orbitals.

 

[delano2000]

What text are you using? Is this Organic I or II?

I am in my first week of Organic I and so far we have only had to determine the charge's direction, not the actual value.

The text is Organic Chemistry, 9th or 7th ed.

 

[pharm B]

I'm an idiot. They're all "sp3" orbitals. I wasn't thinking straight.

The Carbons all have 4 bonds each. ex: The end C is connected to 3 H's and another C. It's shape is tetrahedral and the C is sp3 hybridized.

refresher source:
http://www.mhhe.com/physsci/chemistry/carey5e/Ch02/ch2-3-1.html

• "Blend" (i.e. hybridise) the s and the three p orbitals...
  • since we "mixed" 4 orbitals, we get a set of 4 sp3 orbitals

 

[Miss Arm]

1. Determine the partial negative charge on the fluorine atom in a C-F bond. Bond length = 1.39 angstrom, bond dipole moment is 1.60 D.
2. What orbitals are used to form the 10 covalent bonds in propane?

1. Please check out http://en.wikipedia.org/wiki/Bond_dipole_moment, and see if you can figure it out.
2. Hope http://en.wikipedia.org/wiki/Alkane can help you.

 

[delano2000]

OK. I am guessing the answer to #2 is: sp3

 

[Miss Arm]

It is true for the carbons, but what about the hydrogens?

OK. I am guessing the answer to #2 is: sp3

 

[delano2000]

1. Please check out http://en.wikipedia.org/wiki/Bond_dipole_moment, and see if you can figure it out.
2. Hope http://en.wikipedia.org/wiki/Alkane can help you.

Thanks. This was very helpful.

 

[delano2000]

It is true for the carbons, but what about the hydrogens?

With the hydrogens I think it is 1s...right?

 

[tungsten87]

make sure you brush up on your molecular orbital theory now before you get deep in the class where you have to deal with the importance of alignment of orbitals in conformation and in predicting the stereochemistry of reactions. check these out...

http://www.grandinetti.org/Teaching/Chem121/Lectures/MOTheory/

http://www.ch.ic.ac.uk/vchemlib/course/mo_theory/main.html