Aromaticity 1

Question 1

Define conjugation?

Answer 1

Conjugated is the overlap of more than 2p orbitals in an acyclic or cyclic system (allowing resonance forms to exist)

Question 2

Aromaticity does not require a cyclic system to be fully conjugated. TRUE OR FALSE?

Answer 2

FALSE

Question 3

The more bonds the more stable the resonance form. TRUE OR FALSE?

Answer 3

TRUE

Question 4

Resonance form must have the same number of paired and unpaired electrons. TRUE OR FALSE?

Answer 4

TRUE

Question 5

Separation of charge is not destabilising. TRUE OR FALSE

Answer 5

FALSE

Question 6

In charged species delocalization is stabilizing in energy terms and therefore good. TRUE OR FALSE?

Answer 6

TRUE

Question 7

Electronegativity is not important in aromaticity. TRUE OR FALSE?

Answer 7

FALSE

Question 8

Tautomerism is also known as dynamic isomerism. TRUE OR FALSE?

Answer 8

TRUE

Question 9

With resonance form:

• Cannot change connectivities
• Total charge remains the same
• Must form valid lewis structures
• Number of electrons must be conserved
• Sp3 hybridized carbons act as a road block

Are all these statements TRUE OR FALSE?

Answer 9

TRUE

Question 10

What are the four factors that makes a molecule aromatic?

Answer 10

1. Cyclic
2. Fully conjugated
3. Planar
4. Aromatic systems will contain (4n+2) pie electrons where n=0,1,2,3