Rings & Double Bonds

Reading a formula for hidden structure

An interactive lesson with 5 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• DoU = (2C + 2 − H)/2; each ring or double bond counts 1 (triple 2).
• Halogens count as H; oxygen is ignored.

Steps

1. Missing hydrogens
2. Benzene’s formula
3. Five ways to lose two hydrogens
4. Bromine water test
5. Read the formula