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Chapter 8: Q64P (page 375)

Draw resonance contributors for the following ions:

Short Answer

Expert verified

a)

b)

c)

d)

Step by step solution

01

What is resonance contributors

Resonance contributors involve the 'imaginary movement' of pi-bonded electrons or of lone-pair electrons that are adjacent to pi bonds. You can never shift the location of electrons in sigma bonds – if you show a sigma bond forming or breaking, you are showing a chemical reaction taking place.

02

Final answer

So the resonance contributors are-

a)

b)

c)

d)

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a. How many MOs does the compound have?

b. Which are the bonding MOs, and which are the antibonding MOs?

c. Which MOs are symmetric, and which are antisymmetric?

d. Which MO is the HOMO and which is the LUMO in the ground state?

e. Which MO is the HOMO and which is the LUMO in the excited state?

f. What is the relationship between HOMO and LUMO and symmetric and antisymmetric orbitals?

g. How many nodes does the highest-energy MO of 1,3,5,7-octatetraene have between the nuclei?
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