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How to draw a benzene ring

The two correct ways to draw benzene — Kekulé alternating double bonds and the modern circle inside a hexagon — and when to use each.

Quick answer Draw a regular hexagon. Either add three alternating double bonds inside (Kekulé) or draw a circle in the middle (modern aromatic notation). Both are correct; chemists usually use the circle for substituted benzenes and Kekulé when they need to show electron movement in a mechanism.

Start with a hexagon

Six equal-length lines making a flat-topped (or pointy-topped) hexagon. Equal angles, equal sides. If your hexagon is lopsided, your substituents will look like they belong to two different molecules.

Kekulé form: alternating double bonds

Add a second parallel line on three of the six bonds — alternating. So your hexagon has bonds going single–double–single–double–single–double around the ring. The double-bond positions don't correspond to fixed locations in reality (all six bonds are equal in length), but Kekulé form is essential for arrow-pushing in mechanisms because you need to show which electrons move.

Circle form

A perfect circle inscribed in the hexagon — slightly smaller than the inscribed circle of the hexagon itself, centered. This is shorthand for "six delocalized π electrons." Use it when you don't need to track individual π bonds: pure substitution patterns, structural overviews, NMR/IR practice problems.

Substituents go on the corners

When you draw a substituent, attach it to a vertex, not the middle of a bond. Long substituents go to the side (3, 4, or 5 o'clock positions usually) to keep the structure readable. For disubstituted rings, label positions as ortho (1,2), meta (1,3), or para (1,4).

Draw this on the whiteboard

Open the OChem Board whiteboard — benzene rings, wedge/dash bonds, and a clickable periodic table built in. No account needed.

Open the whiteboard →