Word Count : 150

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CH3–CH2F2 (1,1-difluoroethane) and CH2F–CH2F (1,2-difluoroethane) are the constitutional isomers. Using internal rotation about C–C, the attainable symmetry is torsion-dependent. For 1,2-difluoroethane, the staggered anti conformer has a C2 axis along C–C and an inversion center at the _________ ___ __________ _____ ________ __________ __________ _______ ___ _____ ____.
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