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Chemistry Homework Help => CBSE XI and XII Chemistry => Topic started by: Pranjal Singh on September 20, 2020, 12:41:43 AM

Title: Bond Length comparison
Post by: Pranjal Singh on September 20, 2020, 12:41:43 AM
Here it is
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Title: Re: Bond Length comparison
Post by: uma on September 20, 2020, 10:39:20 AM
SF4 - has four bond pairs and one lone pair so it has distorted Trigonal bipyramidal geometry which is called as see saw or distorted tetrahedral.Now lone pairs in this shape are present on equitorial which causes more repulsion to axial bonds .Axial bonds are at nearly 90 o angle to equitorial lone pairs so faces maximum repulsion.To minimize repulsion there is  lenthening of the axial bonds .
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Title: Re: Bond Length comparison
Post by: Dhamnekar Winod on October 05, 2020, 10:44:03 AM
Hello,
  In AsF3,AsF4-, AsF4+,AsF6-, what does A imply? Is it another element?
Title: Re: Bond Length comparison
Post by: Dhamnekar Winod on October 05, 2020, 11:31:10 AM
 Hello,

This  question is about the bond lengths of Arsenic trifluoride, Arsenic tetrafluoride cation and anion, hexafluoroarsinate ion(anion).
Title: Re: Bond Length comparison
Post by: uma on October 07, 2020, 07:44:55 PM
Quote from: Dhamnekar Winod on October 05, 2020, 11:31:10 AM
Hello,

This  question is about the bond lengths of Arsenic trifluoride, Arsenic tetrafluoride cation and anion, hexafluoroarsinate ion(anion).
As is Arsenic element
Title: Re: Bond Length comparison
Post by: uma on October 07, 2020, 08:58:27 PM
Quote from: uma on October 07, 2020, 07:44:55 PM
As is Arsenic element
Bond length order-
AsF4+  < AsF3   <AsF6-

In AsF3 (sp3) and AsF4+ (sp3)bond lengths are comparable as orbitals involved are same. However lone pairs on As in ASF3 will make them slightly longer than AsF4+.
In AsF6- however sp3d2 orbitals are involved which are bigger than sp3 orbitals so bond lengh in AsF6- is more than AsF3 and AsF4+


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