A straight chain of hydrocarbon has molecular formula C8div0 .The hybridization for the carbon atoms from one sp3 , sp2 ,sp2, sp3,sp2,sp2,sp and sp. The structural formula of hydrocarbon would be ?

'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