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![[Post New]](/templates/default/images/icon_minipost_new.gif) 28 Jan 2008 18:15:10 IST
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Statement 1- Fructose and glucose react with tollens reagent Statement 2-Both glucose and fructose are C6H12O6 A-both are right,2 explains 1 B-both are right , 2 is not the reason for 1 C-1 is right,2 is wrong D-1 is wrong ,2is right Post the answer, i ll tell u which is right in 15 mins
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28 Jan 2008 18:22:13 IST
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ans is D.
n i think its:
Statement 1- Glucose and fructose react with tollens reagent
glucose has -CHO gp. so it reacts with tollens reagent. Fructose has -CO-. so it doesn't.
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28 Jan 2008 18:24:17 IST
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D) 1 is wrong, 2 is right
reason for 1 is that glucose has free aldehydic group whereas fructose does not.
(oh and you wrote both fructose by mistake in your question)
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* Gaurav Ragtah ( aka Artemis Fowl )
* Agent 'G' [sniper] - SD-6 (Alliance of Twelve)
* Your friendly neighborhood spideyunlimited |
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28 Jan 2008 18:33:55 IST
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EDITED sorry
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" Always remember money isn't everything but make sure you have made a lot of it before talking such nonsense!"
- Bill Gates |
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28 Jan 2008 18:34:41 IST
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thnx for correction spidey
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" Always remember money isn't everything but make sure you have made a lot of it before talking such nonsense!"
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28 Jan 2008 19:53:08 IST
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Fructose is a reducing sugar , so it can react with tollens reagent .
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28 Jan 2008 19:58:50 IST
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nadeem noidu... ur sayin the reverse,,, its glucose which is reducing
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* Gaurav Ragtah ( aka Artemis Fowl )
* Agent 'G' [sniper] - SD-6 (Alliance of Twelve)
* Your friendly neighborhood spideyunlimited |
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28 Jan 2008 20:16:07 IST
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I had learned just today from brilliant's material that both glucose and fructose show tollens and fehlings tests.( a list of compounds which show the tests is given)
fructose is reducing , see here http://en.wikipedia.org/wiki/Fructose
check this also http://www.goiit.com/posts/list/organic-chemistry-reducing-sugar-37816.htm
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28 Jan 2008 20:30:09 IST
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answer is b... fructose answers tollens cuz isomerization 2 form struct of glucose/mannose... so it reduces tollens...ob 2nd part aint d reason so 'B'
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29 Jan 2008 12:56:27 IST
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yes answer is B....... i have posted the reason in this link............
http://www.goiit.com/posts/list/organic-chemistry-reducing-sugar-37816.htm
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29 Jan 2008 13:18:16 IST
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the ans must be B
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29 Jan 2008 13:20:09 IST
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D-1 is wrong ,2is right whatever b the reason, in general, Ketones do not reduce tollen's reagent.
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29 Jan 2008 13:41:23 IST
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the ans is D.
glucose has an aldehydic grp n so it reacts with tollens reagent, while, fructose has a ketonic grp and so it doesnt. also, they ve the same molecular structure
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29 Jan 2008 21:55:53 IST
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fwks_phoenix and viswanath........... please see the link i have provided
http://www.goiit.com/posts/list/organic-chemistry-reducing-sugar-37816.htm
........ and then decide the answer...........
dint you learn this in your iit coaching classes.............
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