Sapling HW Weeks 5,6 Question #4

[Uyenvy Nguyen 1D]

This question shows the Lewis structure of a carbamate ion, and it asks us to the 2 other major resonance structures. I was able to correctly draw the one with a double bond between N and C (N=C), but I keep getting the other resonance structure with a single bond between N and C wrong.

Can someone tell me what the correct structure would look like (with the formal charges, # of lone pairs, etc.)?

[Xinying Wang_3C]

Hi, another resonance structure would be a double bond between C and O(C=O), basically switch the structure given by the question to another O molecule. And the O with 6 lone pairs will have a negative formal charge. Hope this helps.

[Uyenvy Nguyen 1D]

thank you!

[Giselle Simmons 2D]

For the other major resonance structure, consider creating a double bond between Nitrogen and Carbon.

[505706331]

the other one would have a double bond between the other o and c

[Wenhan Li_3d]

For another resonance structure, you basically exchange the double and the single bond with two O-C bonds.

[105532700]

This question was very helpful for me

[105707059]

Can someone explain the second resonance structure with the double bond between N and C? I put the positive charge on the N and a negative charge on the O's but keep getting it wrong.

[305723807]

i was confused about this as well

[SophieCacdac_3H]

To answer the question about the second resonance structure with the double bond between N and C:
As you said the N should have a positive charge and the O's should a negative charge. Maybe you kept the double bond between C and O? The only double bond should be between N and C for this structure so the O's both have a single bond, 6 lone electrons, and a negative charge. The hydrogens stay the same.