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Despite having an aldehyde group : (a) Glucose does not give 2,4-DNP test. What does this indicate ? (b) Draw the Haworth structure of alpha-D-(+)-glucopyranose. (c) What is the significance of D and (+) here? |
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Answer» Solution :(a) Thisis because- CHO is notfree in glucose. Itis bound. It isbound to - OH group in the CYCLIC structure . (b)  (C) D representsconfigurationof thecompound, i.e.,- OH group on firstchaial C atom fromthe bottomis downwards (+). signshowsthatit is dextrorotay i.e.,ROTATES the PLANE of polarised lightto the right . |
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