4.81  [ENDORSED]

(Polar molecules, Non-polar molecules, etc.)

Moderators: Chem_Mod, Chem_Admin

Liam Maxwell 2E
Posts: 53
Joined: Fri Sep 29, 2017 7:07 am

4.81

Postby Liam Maxwell 2E » Wed Nov 29, 2017 11:25 pm

4.81 is asking for the Lewis structure of the borazine (B3N3H6). the boron and nitrogen molecules alternate to form a hexagon core where each one is also attached to one hydrogen. In the solutions manual it has a double bond for every other bond in the hexagon. However, this means the nitrogen have a formal charge of +1 and the borons have a formal charge of -1. Why are all the bonds not single bonds with lone pairs on the nitrogen. This would mean no atoms have a formal charge. I am aware boron would not have a full octet, but I though they were an exception to this rule.

Chem_Mod
Posts: 18400
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 435 times

Re: 4.81  [ENDORSED]

Postby Chem_Mod » Thu Nov 30, 2017 8:35 am

The wording of the question gives you the hint that borazine will have an alternating single and double bond structure like benzene. This arrangement leads to the phenomenon of "aromaticity" which, like in benzene, makes the molecule significantly more stable than if it had all single bonds.


Return to “Determining Molecular Shape (VSEPR)”

Who is online

Users browsing this forum: No registered users and 3 guests