Can I R S nomenclature or thrio arithrio from sawhorse staggered by newman staggered then Newman eclipst then Fischer projection . I don`t understand the change between sawhorse staggered to sawhorse eclipse . where the front carbon is rotate in 180° angle.

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane