{{DISPLAYTITLE:C5H10}} C5H10 is the molecular formula' of 13 hydrocarbon isomers (represented by their CAS numbers on the chart). They can be divided into cycloalkanes and alkenes. Cycloalkanes Cyclopentane (CAS 287-92-3) Methylcyclobutane (CAS 598-61-8) Cyclopropanes Ethylcyclopropane (CAS 1191-96-4) 1,1-Dimethylcyclopropane (CAS 1630-94-0) (R,R)-1,2-dimethylcyclopropane or (1R-trans)-1,2-dimethylcyclopropane (CAS 20520-64-3) (S,S)-1,2-Dimethylcyclopropane or (1S-trans)-1,2-dimethylcyclopropane (CAS 38447-23-3) (R,S)-1,2-Dimethylcyclopropane or cis-1,2-dimethylcyclopropane (CAS 930-18-7) Alkenes Pentenes 1-Pentene (CAS 109-67-1) cis-2-Pentene (CAS 627-20-3) trans-2-pentene (CAS 646-04-8) Butenes 2-Methyl-1-butene (CAS 563-46-2) 3-Methyl-1-butene (CAS 563-45-1) 2-Methyl-2-butene (CAS 513-35-9)