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The answer is in the name. "Pent" means there are 5 carbon atoms in a row. "Methyl" means there is another carbon with three hydrogens attached connected to one of them. "ene" means there is a carbon to carbon double bond somewhere along the chain and the fact it is not numbered also means it is on the end. The "2" means the methyl group is attached to the second carbon atom counting from the end with the double bond.

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15y ago

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