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Haloform test is shown by
1) simple aldehydes,ketones
2) alpha hydroxy aldehydes and ketones
3) formic acid.
Acid or its derivatives like CH3CONH2,ESTER ,anhydride do not give haloform test because they have resonance. That means they do not contain pure -COCH3 group. Any compound containing pure -COCH3 group gives haloform test.
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Haloform test is shown by 1) simple aldehydes,ketones 2) alpha hydroxy aldehydes and ketones 3) formic acid. Acid or its derivatives like CH3CONH2,ESTER ,anhydride do not give haloform test because they have resonance. That means they do not contain pure -COCH3 group. Any compound containing pure -COCH3 group gives haloform test.