Which of the following alkanes is a structural isomer of cis-hex-3-ene?

Question

BlackTom AI · Accepted Answer

To determine structural isomers, we compare compounds that have the same molecular formula but different connectivities.
Option a: 3-methylpentane is an all-carbon chain (C6H14). Since cis-hex-3-ene has the formula C6H12 due to its double bond, this option does not share the same formula and cannot be a structural isomer of cis-hex-3-ene.
Option b: 2,3-dimethylbutane is also a saturated alkane with formula C6H14. Like the previous option, it does not match the C6H12 formula of an alkene and thus is not a structural isomer of cis-hex-3-ene.
Option c: cyclohexane is a cycloalkane with the same molecular formula as cis-hex-3-ene, namely C6H12. Its connectivity is different (a ring with no double bond versus an open chain with a double bond), so it qualifies as a structural (constitutional) isomer.
Option d: hexane is a straight-chain alkane with formula C6H14, again not matching the C6H12 formula of cis-hex-3-ene, so it cannot be an isomer of it.
In summary, only cyclohexane shares the same molecular formula as cis-hex-3-ene and differs in connectivity, which makes it the correct choice as a structural isomer.

MUF0042 Chemistry Unit 2 - Semester 1, 2025 2.12 Quiz: Alkene Stereoisomers

Which of the following alkanes is a structural isomer of cis-hex-3-ene?

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