Lewis dot structures of complex molecules

[pugtm]

Homework Statement

determine the electron dot structure of molecules a and b
http://session.masteringchemistry.com/problemAsset/1144353/2/MMAt.05.067.jpg

Homework Equations

The Attempt at a Solution

A)

::O: H
| |
H-C=N-HB)
H
| ..
H-C-N=C=O::
|
H

I am not at all sure this is correct and the software that accepts answers for my school agrees with that assesment, any assistance will be greatly appreciated

 

[chemisttree]

Your first answer has a single bond between the carbon and the oxygen. That oxygen also has six other electrons around it. Would that result in the oxygen having a charge? You also show the enamine (with friends like that, who needs enamines?) nitrogen having four bonds to it. What would the charge be for that? Does your assignment want you to postulate neutral species? I'm betting it does.

 

[Blueshift5]

.

I would first like to commend you for attempting to determine the Lewis dot structures of molecules A and B on your own. This is an important skill in chemistry and it will help you understand the electronic structure of molecules better. However, I would like to point out a few things about your proposed structures.

Firstly, in molecule A, the nitrogen atom should have a lone pair of electrons, represented by two dots, instead of a single bond. This is because nitrogen typically forms three bonds and has one lone pair of electrons. Additionally, the carbon atom should have a double bond with nitrogen, represented by four dots, instead of a single bond. This is because carbon can form four bonds and in this case, it is forming a double bond with nitrogen.

In molecule B, the carbon atom should not have a double bond with nitrogen. Instead, it should have a single bond with nitrogen and a double bond with oxygen. This is because carbon typically forms four bonds and in this case, it is forming a single bond with nitrogen and a double bond with oxygen.

Based on these corrections, the correct Lewis dot structures for molecules A and B are:

A) H
| ..
H-C=N-H
| |
::O

B) H
| ..
H-C-N=O::
|
::O

I hope this helps clarify any confusion and helps you in your future chemistry studies. Keep up the good work!