InterviewSolution
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InterviewSolution
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(a) Despite having an aldehydic group, glucose does not give 2, 4-DNP test. What does it indicate ? (b) Draw Haworth structure of `alpha-D(+)` glucopyranose (c ) What is the significance of D and (+) here ? |
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Answer» (a) Since glucose does not given 2, 4-DNP test, this means that the aldehydic group present in it is not available for chemical reaction. In fact, it is involved in the formation of hemiacetal ring which is a six membered oxide ring. (b) For the structure of `alpha-D(+)` glucopyranose, (c ) The symbol D signifies that the configuration of last chiral carbon `(C_(5))` in glucose is same as that of D-glyceraldehyde. Similarly, (+) sign means that glucose is dextro rotatory in nature. |
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