Which molecule most likely to deviate from ideal values?

  • #1
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Hi,

Hoping I could get some help on this one.
How would I know what causes bond angles to deviate from the ideal values?

I greatly appreciate any help and advice on this.

Thanks
 

Answers and Replies

  • #2
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Anything that breaks the symmetry; 35Cl instead of 36 in a CCl4 molecule; you name it.
 
  • #3
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Is there any connection between polarity?
 
  • #5
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If so, how would you compare between different molecules? Like if I were to compare which molecules deviated THE MOST from the "ideal" values...
for example BrCl3, XeCl4, or CO
 
  • #6
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does deviation correspond to the number of lone pairs on the central atom, but even then XeCl4 and BrCl3 both have 2 pairs so I'm super confused.
Or does it have to do with location of the lone pairs?
 
  • #7
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bond angles
CO? A straight line is a straight line. What are the "ideal" values for the other two? Which isotopes/isotope combinations are you considering "ideal?"
XeCl4 and BrCl3 both have 2 pairs
Two pairs? What are you counting?
 
  • #8
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but arent there lone pairs of electrons for central atom (either C or O) CO or do they not affect the bond angles?

for XeCl4 and BrCl3, I am counting the number of lone pairs of electrons.
so there would be 2 pairs of lone pairs on the central atom (Xe and Br, respectively), right?
 
  • #9
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I am considering the VSEPR to be "ideal", sorry for any confusion
 
  • #10
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I think I got it. It has to do with the placement of lone pair of electrons on the central atom.

Thanks
 
  • #11
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central atom (either C or O) CO
One bond can NOT make an angle.
would be 2 pairs of lone pairs on the central atom (Xe and Br, respectively)
Yes.
VSEPR
So, that's back in fashion --- two pairs --- one on one side and the other opposite --- "pair repulsion" --- what are your thoughts?
 
  • #12
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I think I got it. It has to do with the placement of lone pair of electrons on the central atom.
Yes --- You're welcome.
 

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