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The greater stability of cis-2-butene compared to 1-butene is attributed to the increased hyperconjugation in the former, as it has 6 α-hydrogen atoms compared to 2 α-hydrogen atoms in the latter.

1. The stability is due to enhanced hyperconjugation in cis-2-butene.
2. The stability is unrelated to the number of α-hydrogen atoms.
3. 1-butene is more stable due to fewer α-hydrogen atoms.
4. Hyperconjugation plays no role in the stability of alkenes.

Correct answer: The stability is due to enhanced hyperconjugation in cis-2-butene.

Solution

The stability of alkenes is influenced by hyperconjugation, and cis-2-butene has more hyperconjugative structures due to the presence of 6 α-hydrogen atoms compared to 1-butene, which has only 2 α-hydrogens.

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