Question

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

Explanation:

Step1: Recall resonance definition

Resonance structures have same connectivity of atoms, same number of electrons, and differ only in the position of pi - bonds and non - bonding electrons.

Step2: Analyze first row

The two structures have different numbers of formal charges and different positions of double bonds in a way that can be interconverted by resonance. So, they are resonance structures.

Step3: Analyze second row

These two structures can be interconverted by moving a lone pair of electrons on oxygen to form a pi - bond and moving the pi - bond electrons to create a formal charge on the adjacent carbon. They are resonance structures.

Step4: Analyze third row

The two structures represent different resonance forms of a cyclic conjugated system where the pi - bonds are delocalized. They are resonance structures.

Step5: Analyze fourth row

The two structures can be interconverted by the movement of pi - bond electrons and creation of a formal charge. They are resonance structures.

Answer:

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