Assertion : 2-bromobutane on reaction with sodium ethoxide in ethanol gives 1-butene as a major product. Reason : 1-butene is more stable than 2-butene.

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2-bromobutane on reaction with sodium ethoxide in ethanol gives 2-butene as a major product.
This is according to Saytzeff's rule i.e. the predominant product is the most substituted alkene. 2-butene is more stable than 1-butene due to presence of large number of hyperconjugating structures in 2-butene.

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