[Co(cl)2(NH3)4]^(+) ..... tetraammoniadichloridocobalt(|||) is a AB6L type of molecule , shape is octahedron. But how?? plz explain the hybridisation of the compound

'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