Question

decide whether each row is a set of resonance structures for a single molecule and select yes or no in the last column.

Explanation:

Step1: Recall resonance structure criteria

Resonance structures have same connectivity of atoms and same number of valence - electrons, only differ in electron - pair distribution.

Step2: Analyze first row

The two structures have different connectivity of charge (one has positive charge on one end and negative on the other compared to neutral in the first structure), so they are not resonance structures.

Step3: Analyze second row

These two structures have the same connectivity of atoms and differ only in the position of the positive charge and the double - bond, so they are resonance structures.

Step4: Analyze third row

These are resonance structures as they have the same atom connectivity and differ only in the position of the double - bonds in the ring.

Step5: Analyze fourth row

The two structures have the same connectivity of atoms and differ only in the position of the double - bond and the negative charge, so they are resonance structures.

Answer:

1. no
2. yes
3. yes
4. yes