Question

part 2 (1 point) draw lewis structures for pyrazine (c4h4n2) showing the two most common resonance forms. draw the lewis structures with the formal charges minimized. do no add curved arrows to structures. do not add an arrow or plus sign between the structures.

Explanation:

Step1: Count valence electrons

Carbon has 4 valence electrons, hydrogen has 1, and nitrogen has 5. For $C_4H_4N_2$, total valence - electrons = $4\times4 + 4\times1+2\times5=30$.

Step2: Arrange atoms

Connect the atoms to form a ring structure with carbon - carbon and carbon - nitrogen bonds. Each carbon is bonded to one hydrogen.

Step3: Add lone pairs and double bonds

Add lone pairs to nitrogen atoms and double bonds to satisfy the octet rule for all atoms while minimizing formal charges. The two resonance structures will have double - bond positions interchanged between carbon - carbon and carbon - nitrogen bonds.

Answer:

(It is not possible to directly draw Lewis structures in this text - based format. But the description above can be used to draw them. The two resonance structures will have a six - membered ring with two nitrogen atoms opposite each other in the ring, and alternating double bonds to minimize formal charges.)