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What is the chemical formula of substances which gives a positive iodoform test?

The ketones containing terminal -COCH3 group generally gives positives Iodoform test. For example butan-2-one,  Pentan-2-one, Acetone etc.
It is Most common test for terminal methyl ketones but Iodoform also given by terminal 2° alcohols like Ethanol (CH3CH2OH), Propan-2-ol (CH3CH2(OH) CH3 ), Butan-2-ol, Pentan-2-ol etc
Aldehyde does not gives Iodoform test positive except CH3CHO.
Methylene  active hydrogen containg ketones also gives positive Iodoform test for example  pentane-2,4-dione , Chatechol, and resorcinol etc

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