Organic Chemistry: Find the Isomers Challenge

One of the common problems students have in Organic Chemistry is finding all of the possible isomers for a compound. There are several practise problems that will ask you to find all of these structural isomers.

Note: none of these use stereoisomers (constitutional isomers only) so no E/Z or R/S isomers are needed.
For practice with stereoisomers see this page.

Easy Examples

C₂H₆O C₂H₇N C₃H₇F C₃H₈O C₅H₁₂

C₃H₆Cl₂ C₃H₆FCl C₂H₆O₂ C₃H₆FBr C₃H₅Cl₃

Medium Examples

C₂H₈N₂ C₃H₄Cl₄ C₄H₁₀O C₂H₇NO C₃H₅F₂Br

C₃H₆O C₄H₆ C₅H₁₀ C₅H₁₁Cl C₄H₈Cl₂

Hard Examples

C₃H₈O₂ C₄H₇F C₅H₁₂O C₃H₄F₂Br₂ C₅H₁₃N

C₅H₈ C₆H₁₂ C₄H₅N C₃H₅N C₂H₅NO

Extra Hard Examples

C₄H₈O C₄H₉OCl C₃H₅OCl C₄H₆Cl₂ C₄H₁₀O₂

Insanely Hard Examples

C₄H₆ClBr C₃H₆O₂ C₄H₈O₂

Just plain Insane Examples

C₄H₉NO : > 70 isomers C₅H₁₀O : > 90 isomers