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For 1-butene, the central H2CdCH-CH2CH3 bond prefers a conformation in which the CdCH2 bond eclipses one of the C3-H bonds.

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For 1-butene, the central H2CdCH-CH2CH3 bond prefers a conformation in which the CdCH2 bond eclipses one of the C3-H bonds.
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