🤓 Based on our data, we think this question is relevant for Professor Achari's class at BU.
The compound 2,6-dimethylpyrazine (below) gives chocolate its odor and is used in flavorings. In what type of hybrid orbital do the lone pairs of N reside?
Recall: Sigma σ bonds are formed from the end-to-end overlap of s-p hybrid orbitals. On the other hand, pi π bonds are formed from the side-to-side overlap of unhybridized p orbitals.
From the Lewis structure, we can see that each nitrogen atom in 2,6-dimethylpyrazine forms two σ bonds, one π bond, and holds a single lone pair.