Which of the following is the correct molecular formula for butene?

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Multiple Choice

Which of the following is the correct molecular formula for butene?

Explanation:
Butene is an alkene, so it contains four carbon atoms and one C=C double bond. Alkenes follow the formula CnH2n, so with n = 4 the molecular formula is C4H8. The two butene isomers—1-butene and 2-butene—share this same formula. The other formulas describe different hydrocarbons: C4H10 is butane (an alkane with no double bonds), C3H6 is propene (three carbons with a double bond), and C5H8 corresponds to a five-carbon compound with more unsaturation, not butene.

Butene is an alkene, so it contains four carbon atoms and one C=C double bond. Alkenes follow the formula CnH2n, so with n = 4 the molecular formula is C4H8. The two butene isomers—1-butene and 2-butene—share this same formula. The other formulas describe different hydrocarbons: C4H10 is butane (an alkane with no double bonds), C3H6 is propene (three carbons with a double bond), and C5H8 corresponds to a five-carbon compound with more unsaturation, not butene.

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