6.2.1: Aromatic compounds

Question 1

Aromatic compounds

Answer 1

Contain a benzene ring

Question 2

Benzene molecular formula

Answer 2

C6H6

Question 3

Benzene structure

Answer 3

planar cyclic structure

Question 4

Benzene bonding

Answer 4

Each carbon forms two single covalent bonds to the carbon atoms on either side of it and one to the hydrogen atom. Final unpaired electron located in the p-orbital which sticks out above and below the plane of the ring

Question 5

P-orbitals on each carbon in benzene

Answer 5

p-orbitals can combine to form a new ring of delocalised electrons and all the bonds in the ring are the same length which is between a single or double bond.

Question 6

How is the delocalised ring of electrons in benzene drawn

Answer 6

as a circle

Question 7

What indicates a more stable compound

Answer 7

more energy required when breaking bonds so its more stable

Question 8

Why is benzene more stable than cyclohexa-1,3,5-triene

Answer 8

In a delocalised ring the electron density is shared over more atoms which means the energy of the molecule is lowered and its becomes more stable

Question 9

Naming aromatics
if the benzene ring is the main FG
if the benzene ring isn’t the main FG

Answer 9

main FG: suffix; -benzene

not main FG: preffix; -phenyl/phen