CELL STRUCTURES AND FUNCTION
BIO MOLECULES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Glucose forms pentaacetate
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Glucose reacts with hydroxylamine to form an oxime.
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Pentaacetate of glucose does not react with hydroxylamine.
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Glucose is oxidised by nitric acid to gluconic acid
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Detailed explanation-1: -The pentaacetate of glucose does not react with hydroxylamine indicating the absence of free-CHO group. This property of glucose can be explained only by its cyclic structure.
Detailed explanation-2: -Hydroxylamine reaction: when D-glucose is reacted with hydroxylamine, due to the aldehydic group present in it, oxime formation occurs. However, D-glucose pentaacetate does not react with hydroxylamine because the aldehyde group is absent.
Detailed explanation-3: -Solution : Due to the absence of OH group at ‘C (1)‘, cyclic structure of glucose pentaacetate cannot revert to open chain aldehydic from. Hence, it cannot form an oxime.
Detailed explanation-4: -(3) Glucose exists in two crystalline forms − and. The-form (m.p. = 419 K) crystallises from a concentrated solution of glucose at 303 K and the -form (m.p = 423 K) crystallises from a hot and saturated aqueous solution at 371 K. This behaviour cannot be explained by the open chain structure of glucose.
Detailed explanation-5: -Beta-d-glucose pentaacetate is an organooxygen compound. It is functionally related to a hexacarboxylic acid. beta-D-Glucose pentaacetate is a natural product found in Wendlandia tinctoria with data available.