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Organic Chemistry

Blazing goIITian

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25 Feb 2009 09:51:21 IST

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List the chemical reactions of glucose which can not be explained by its open chain structure.

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List the chemical reactions of glucose which can not be explained by its open chain structure.

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MUSKAAN

Blazing goIITian

Joined: 16 Jan 2008

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25 Feb 2009 10:06:16 IST

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It doesnot give 2-4DNP test besides of having an aldehydic grp because the aldehydic grp in glucose is not free. It is linked to the third carbon of the glucose.

bella

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Joined: 6 Feb 2009

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25 Feb 2009 12:00:12 IST

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it does not give schiff's reagent test..pentaacetate of glucose does not react wi hydroxylamine,,,,,glucosides do not show any mutarotation,,,dnt reduce fehling's solution,,,dnt react wid HCN....

ranvirghosh

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28 Sep 2011 09:36:24 IST

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not good enough...

ranvirghosh

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28 Sep 2011 09:39:23 IST

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penta acetate of glucose dose not form Oxime with hydroxylamine becoz CHO group is not free in glucose molecule . Glucose solution fails to explain mutarotation .....

Madhusudan Chavan

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28 Sep 2011 16:25:38 IST

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Open chain structure of glucose fails to explain the following facts:

1) Glucose does not form NaHSO3 addition product, does not form aldehyde ammonia, does not respond to Schiff's reagent.

2) Glucose reacts with NH2OH to form oxime but glucose penta-acetate does not.

3) Glucose exists in two stereoisomeric forms- alpha and beta.

4) Both alpha and beta glucose undergo mutarotation.

5) D-Glucose forms two methyl glucosides.

6) UV spectrum of glucose does not show the presence of aldehyde group.

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