Compare the Bond lengths of IO2F2 and IOF3

  • #1
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Homework Statement:
Compare the average bondlengths of the following compounds

IO2F2 and IOF3
Relevant Equations:
Bent rules

%S charecter inversly proportional to bond lenth
Okay So our Chemistry Professor gave us the answer as the following

IO2F2 has a larger bond length than IOF3

The reason being is once you draw the structures of the compounds IO2F2 has more number of double bonds that the later hence it shall have more p charecter than IOF3...hence it will have a larger avg bond length.


..but well i sorta dont undestand this logic

Well hear me out, so a single bond is larger than a double bond right, so IOF3
Has 3 single bonds, a lone pair and a double bond while IO2F2 has 2 single , 2 double bonds , and a lone pair...so due to the latger no of single bonds the avg bond lenght will be higher in IOF3

Yea so i think the answer is IOF3 has the larger avg bond length.(as opposed to my professor)

Could you please rectify me if im wrong ?
Thank you :)
 

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Answers and Replies

  • #2
mjc123
Science Advisor
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IO2F2 doesn't exist. Do you mean IO2F2-?

Do you mean average length of all bonds, I-O and I-F? That doesn't seem to be a very meaningful comparison.
 
  • #3
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IO2F2 doesn't exist. Do you mean IO2F2-?

Do you mean average length of all bonds, I-O and I-F? That doesn't seem to be a very meaningful comparison.

The question was just compare average bond lengths. They didnt specify which bonds to compare

And yes, im sorry the copound was IO2F2-
Im so sorry for that error
 
  • #4
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EDIT#1 - THe Question is to compare Average bond lengths of IO2F2- and IOF3


There is an error in the Orignal post where i forgot to add the "-" superscript, sorry for the inconvinience
 
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  • #5
mjc123
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I think you'd have too many electrons round I if you had two I=O double bonds in IO2F2-. In IOF3, replace one F by O- (with a single bond). The IO2 moiety should be O=I-O- ↔ O--I=O (not linear!)
 
  • #6
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I think you'd have too many electrons round I if you had two I=O double bonds in IO2F2-. In IOF3, replace one F by O- (with a single bond). The IO2 moiety should be O=I-O- ↔ O--I=O (not linear!)

I agree with this, but they gave the structure like that in the question.
(Im begining to think this is a horribly framed question...Good job publishers ! Making us students life easier)
 

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