Methylpentene is an alkene with a molecular formula C6H12.
The prefix "methyl-" is derived from the fact that there is a methyl(CH3) branch, the word root "-pent-" is derived from the fact that there are 5 carbon atoms in the parent chain, while the "-ene" suffix denotes that there is a double bond present, as per IUPAC nomenclature.
[1] Following are the possible structural isomers of methylpentene:
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