smhjn17 Posted June 9, 2015 Posted June 9, 2015 Is mild white turbidity a positive result for iodoform test in a sample suspected to contain ethanol?? Also shouldnt glucose n other sugars also show positive for test for alcoholic group....what bt iodoform test with glucose ?
hypervalent_iodine Posted June 9, 2015 Posted June 9, 2015 1. It depends on what you mean by mild white turbidity. If a precipitate is present, it means a positive result. 2. No. The halo form reaction only works if you have a methyl ketone, methyl secondary alcohol, ethanol or ethanal present. None of these are present in glucose.
smhjn17 Posted June 9, 2015 Author Posted June 9, 2015 But i got a white ppt with both glucose and sucrose
hypervalent_iodine Posted June 9, 2015 Posted June 9, 2015 I would need more information about your experiment to know how to help you.
smhjn17 Posted June 9, 2015 Author Posted June 9, 2015 I was performing the test for alcohol group using iodoform test...i got an off white ppt with ethanol..(first adding iodine sol and then decolorize with naoh and heat) Then i thought glucose also has oh- group that is secondary so it should also give iodoform test and it did give similar ppt...so with sucrose
hypervalent_iodine Posted June 9, 2015 Posted June 9, 2015 It should only give a positive result if it is a secondary methyl alcohol. Glucose and sucrose do not have this functionality.
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