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![[Post New]](/templates/default/images/icon_minipost_new.gif) 16 Mar 2008 20:19:36 IST
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today i was reading carbohydrates chpt from arihant.....
wat i found confusinf was in first part they say glucose has op-en structure.....
but in latter half they suddenly say that glucose has closed ring structure....
thay do not tell definitely which structuere to follow.....
plzzz tell me which one is right....
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FAILURE IS NOT FALLING IN LIFE BUT NOT RISING AGAIN AFTER FALLING!!!!!!
I LIKE WAVES NOT BECAUSE THEY RISE AND FALL..
BUT BECAUSE EVERYTIME THEY FALL THEY RISE AGAIN!!!!!!!
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16 Mar 2008 20:23:06 IST
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its actually an eqbm mixture of both the structures :) But the ring structure predominates to 99.99 % and the open chain structure only 0.01 % That's why glucose fails to answer certain tests like schiff's test and NaHSO3 test :)
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16 Mar 2008 20:23:35 IST
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The ring structure is more relevant as the open structure does not explain many other properties of carbonyl compounds like formation of Schiff bases, reaction with tollens/fehling reagents, etc..better explanation given in Morrison and Boyd
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16 Mar 2008 20:26:59 IST
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but if que comes such as it rects with HNO3....etc then which structure to take???
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FAILURE IS NOT FALLING IN LIFE BUT NOT RISING AGAIN AFTER FALLING!!!!!!
I LIKE WAVES NOT BECAUSE THEY RISE AND FALL..
BUT BECAUSE EVERYTIME THEY FALL THEY RISE AGAIN!!!!!!!
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16 Mar 2008 20:48:51 IST
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For any ques of carbohydrate's reactions, Always use its closed ring structure.
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16 Mar 2008 20:52:50 IST
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no for HNO3 open structure shd be considered
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16 Mar 2008 21:00:19 IST
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hey dont confuse me more..... tell me one sure ans
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FAILURE IS NOT FALLING IN LIFE BUT NOT RISING AGAIN AFTER FALLING!!!!!!
I LIKE WAVES NOT BECAUSE THEY RISE AND FALL..
BUT BECAUSE EVERYTIME THEY FALL THEY RISE AGAIN!!!!!!!
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16 Mar 2008 21:01:07 IST
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for HNO3or ny reacn of carbohydrate,ring struc shud b considered
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IIT is always a word which rises E thru' d body. But 2 achieve it U hav 2 drain out d entire E out of the body....
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16 Mar 2008 21:05:00 IST
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but in arihant thay have used open structure...
plz help
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FAILURE IS NOT FALLING IN LIFE BUT NOT RISING AGAIN AFTER FALLING!!!!!!
I LIKE WAVES NOT BECAUSE THEY RISE AND FALL..
BUT BECAUSE EVERYTIME THEY FALL THEY RISE AGAIN!!!!!!!
|
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16 Mar 2008 21:56:48 IST
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compound stays in equilibrium...open ring,alpha and beta forms..
(from ncert)
and we consider different structures for different reactions....work according to ncert...
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16 Mar 2008 22:31:38 IST
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yes its easier to think by the open structure. For showing any reaction man, open structure is easier to use but for certain concepts that involve ring, we can only explain using ring structure
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17 Mar 2008 10:34:48 IST
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for problems in volving the reactivity of the aldehyde group consider open structure only when there is an ambiguity go for the cylic one !!!! (like schiff test and melting point and all) still confused??? follow NCERT text!!!
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17 Mar 2008 20:30:52 IST
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hey y r all telling to follow NCERT text???? is there no need to do this chapter from arihant or any higher level books....
i mean is it not that imprtant???
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FAILURE IS NOT FALLING IN LIFE BUT NOT RISING AGAIN AFTER FALLING!!!!!!
I LIKE WAVES NOT BECAUSE THEY RISE AND FALL..
BUT BECAUSE EVERYTIME THEY FALL THEY RISE AGAIN!!!!!!!
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17 Mar 2008 21:05:24 IST
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no they are all saying to follow what structure to consider when from the ncert
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20 Mar 2008 09:20:41 IST
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