last problem on midterm

[705160853]

on the last problem, how do you know its one double bond and not tow double bonds or the lewis structure?

[Brandon Mo 4K]

I assume that you are referring to Q8A.

If you have two double bonds, it would cause the formal charge on the N to be -1. When you have a negative formal charge, you want to put it on the element with the highest electronegativity, which in this case would be O. You make only one double bond so that you can put the negative formal charge on O, the most electronegative element.

[Sarah Zhao 4C]

Nitrogen can only have a maximum of 8 electrons; its in period 2. If you give it two double bonds, it will have 10!

[Athena L 1B]

What was the problem for this one?

[Chris Freking 2G]

What was the problem for this one?

This was question 8A for the Fall 2018 Chem 14A Midterm