Name the following compounds according to IUPAC system of nomenclature.

CH3CH(CH3)CH2CH2CHO

CH3CH2COCH(C2H5)CH2CH2CI

CH3CH=CHCHO

'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