Fall 2012 Q6A [ENDORSED]

[Chem_Mod]

The problem description states that there are "lone pairs omitted" and "...some of the hydrogen atoms attached to carbon atoms are omitted."

Thus, it is helpful to write in the missing H atoms on the ring and the lone pairs on the N and both O atoms.

If you do this, the hybridization (based on the number of regions of electron density) should become apparent.

[Krishil_Gandhi_1D]

I still don't understand this question. Even after writing in the hydrogen atoms, I do not understand hoe the carbon atoms have a sp^3 hybridization. From my point of view, I can only see 3 regions of electron density around the carbon atoms in the ring structure. Thus, I keep getting sp^2. Is there a lone pair somewhere that I am missing? Thanks

[Fengting Liang 1F]

It actually has four areas of electron density because each carbon is attached to two carbons (or one carbon and the nitrogen), as well as two hydrogens.