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Correct order of stability is:

1. cis-2-butene > 1-butene > trans-2-butene
2. trans-2-butene > cis-2-butene > 1-butene
3. 1-butene > cis-2-butene > trans-2-butene
4. cis-2-butene > trans-2-butene > 1-butene

Correct answer: trans-2-butene > cis-2-butene > 1-butene

Solution

Trans-2-butene is more stable than cis-2-butene due to reduced steric hindrance between bulky groups. Both are more stable than 1-butene because of hyperconjugation and alkene substitution effects.

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