Question

decide whether each row is a set of resonance structures for a single molecule and select \yes\ or
o\ in the last column.

Explanation:

Step1: Recall resonance structure criteria

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

Step2: Analyze first row

The two structures have the same atoms connected in the same order, and differ only in the position of π - electrons and formal charges. So they are resonance structures.

Step3: Analyze second row

These two structures have the same connectivity of atoms and differ in the distribution of π - electrons and formal charges on the oxygen and adjacent carbon. They are resonance structures.

Step4: Analyze third row

The two structures have the same connectivity of atoms and differ only in the position of π - electrons in the ring. They are resonance structures.

Step5: Analyze fourth row

The two structures have the same connectivity of atoms and differ in the position of π - electrons and the location of the negative charge. They are resonance structures.

Answer:

1. yes
2. yes
3. yes
4. yes