As a 'Where's Wally?' game, see if you can find the following groups:
- Methyl (CH3), valency 1
- Oxygen (O), valency 2
- The such as a ketone
- Nitrogen (N), valency 3
- The such as part of an aromatic system
- Sulphur (S), valency 2
- Alcohol (OH), valency 1
- Primary amine (NH2), valency 1
- Secondary amine (NH), valency 2