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Difluoroethane (C₂H₄F₂) has two constitutional isomers: 1,2-difluoroethane (CH₂F–CH₂F) and 1,1-difluoroethane (CH₃–CHF₂). For 1,2-difluoroethane, rotation about C–C gives characteristic conformers. The anti-staggered form (F–C–C–F dihedral ≈180°) has a C₂ axis through the C–C bond, an inversion ______ ___ _____ ________ _________ _____ ______ _______ ________ ________ ___ _______.
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