Which of the following is not a structural isomer of but-1-ene

Question

BlackTom AI · Accepted Answer

The question asks which option is not a structural isomer of but-1-ene.
First, recall that but-1-ene has the molecular formula C4H8 and is an alkene (a four-carbon chain with a double bond).
Structural isomers of C4H8 include different arrangements of four carbons with a double bond, such as 1-butene itself, 2-butene (cis or trans), and 2-methylpropene (isobutene). These all share the same molecular formula C4H8 and differ in connectivity.
In contrast, butane has the formula C4H10, which includes only single bonds (an alkane) and thus does not share the same molecular formula as but-1-ene. Because a structural isomer must have the same molecular formula and a different connectivity, butane is not an isomer of but-1-ene.
Therefore, regardless of the lack of listed options in this item, the correct characterization is that butane is not a structural isomer of but-1-ene. This hinges on the fundamental distinction between alkanes (C4H10) and alkenes (C4H8) in both formula and bonding.
If an option list were present, any choice pinpointing a species with formula C4H8 and different connectivity would be a true isomer, while a choice with C4H10 would be the non-isomer based on formula mismatch.

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