smhjn17 Posted June 9, 2015 Share 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 ? Link to comment Share on other sites More sharing options...
hypervalent_iodine Posted June 9, 2015 Share 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. Link to comment Share on other sites More sharing options...
smhjn17 Posted June 9, 2015 Author Share Posted June 9, 2015 But i got a white ppt with both glucose and sucrose Link to comment Share on other sites More sharing options...
hypervalent_iodine Posted June 9, 2015 Share Posted June 9, 2015 I would need more information about your experiment to know how to help you. Link to comment Share on other sites More sharing options...
smhjn17 Posted June 9, 2015 Author Share 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 Link to comment Share on other sites More sharing options...
hypervalent_iodine Posted June 9, 2015 Share 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. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now