Question

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

structures	resonance structures?

| image of first - set of structures | yes
no |
| image of second - set of structures | yes
no |
| image of third - set of structures | yes
no |
| image of fourth - set of structures | yes
no |

Explanation:

1. Resonance structures have the same connectivity of atoms and overall charge, but differ in the placement of π - bonds and non - bonding electrons.

• For the first row: The first structure is a ketone and the second is an enol. They are tautomers (not resonance structures) as they involve a change in the position of a hydrogen atom and a double - bond shift. So the answer is no.
• For the second row: These are resonance structures of a substituted aromatic compound. The double - bond positions are different while the connectivity of atoms remains the same. So the answer is yes.
• For the third row: These are constitutional isomers. They have different connectivity of atoms (the position of the double - bond is different in a non - resonance - related way). So the answer is no.
• For the fourth row: These are resonance structures. The negative charge and the π - bond are delocalized, and the connectivity of atoms is the same. So the answer is yes.

Answer:

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