The molecular formula C6H10 (molar mass: 82.14 g/mol) may refer to many dozens of compounds. Some well studied examples:

Cyclohexene 2,3-Dimethyl-1,3-butadiene 1,2-Hexadiene 1,3-Hexadiene 1,4-Hexadiene 1,5-Hexadiene 2,4-Hexadiene 1-Hexyne 2-Hexyne 3-Hexyne Methylenecyclopentane Bicyclo[2.1.1]hexane 3,3-Dimethyl-1-butyne 4-Methyl-1-pentyne 4-Methyl-2-pentyne 3-Methyl-1-pentyne