[thetomatohead]

The question asks: Draw the lewis structure of a molecule of an isomer.

Definition of an isomer(s): Different substances that have the same formula...

So does that mean just draw a resonance structure of something like NO₃^-? Yeah...just wondering

[Mitch]

Nope, there is a difference between a resonance structure and an isomer.

[thetomatohead]

So what would be an example of an isomer?

[mike]

There are loads of molecules that have isomers. For example propanol, C₃H₈O.

Propanol has isomers, 1-propanol (propan-1-ol) and 2-propanol (propan-2-ol) it also has methyl ethyl ether (if you are feeling adventurous

All of these molecules have the same atoms in them C₃H₈O. However the atoms are just arranged differently.

Good luck

[constant thinker]

Another example of an isomer is Glucose and Fructose. The double bonded O is just moved 1 carbon over and this changes the way the molecule forms a ring.

Draw Glucose and Fructose in a linear structure. Then try drawing it in a ring given you know how to do this. This may help you understand isomers or atleast one aspect of them.