Why does acetic anhydride does not show iodoform test even though it has a CH3-C=0 group whereas cyclohexan-1,3-dione shows iodoform test even though it does not have a CH3-C=O nor CH3-CH(OH) group?

'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