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alpha-D(+)-glucose and beta-D(+) glucose...

`alpha`-D(+)-glucose and `beta`-D(+) glucose are

A

entiomers

B

conformers

C

epimers

D

anomers.

Text Solution

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The correct Answer is:
D
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What is the difference in the structures of alpha-D(+) glucose and beta-D(+) glucose ?

Carbohydrates play a vital role in our daily life. These are classified as monosacchrides, oligosaccharides and polysaccharides depending upon the number of smaller molecules on hydrolysis. It has been suggested that monosaccharides do not have a free aldehyde or ketonic group but have cyclic hemiacetal or hemiketal structures. D - Glucose exists in two isomeric stereoisomeric forms : alpha-D- glucose and beta-D glucose which have different positions of H and OH groups on first carbon atom. Disaccharides such as sucuose, maltose, lactose, etc., give monosaccharides on hydrolysis. Polysaccharides are starch, cellulose, glycogen, having molecular formula (C_(6)H_(10)O_(5))_(n) . Name the water insoluble component of starch.

Knowledge Check

  • Which one of the following is NOT correct for monosaccharides? 1. They are optically active polyhydroxy carbonyl compounds 2.Fructose is ketose sugar and hence it does not give red precipitate with Fehling solution 3. alpha - D(+) glucose and beta - D(+) glucose are anomers 4. Glucose and mannose are anomers

    A
    1,2
    B
    2,3
    C
    2,4
    D
    1,2,3,4

  • In sucrose alpha-D-(+) -glucose and beta-D-(-)- fructose are linked by __________ chain.

    A
    Glycolipid
    B
    Glycosidic
    C
    Phospholipid
    D
    Phosphosidic

  • Pick out the incorrect statements (s) from the following (1) Glucose exists in two different crystalline forms, alpha -D-glucose and beta -D-glucose (2) alpha -D-glucose and beta -D-glucose are anomers (3) alpha -D-glucose and beta -D-glucose are enantiomers (4) Cellulose is a straight chain polysaccharide made of only beta -D-glucose units (5) Starch is a mixture of amylose and amylopecting, both contain unbranched chain alpha -D-glucose unit

    A
    1 and 2 only
    B
    2 and 3 only
    C
    3 and 4 only
    D
    3 and 5 only

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    When alpha-D glucose is dissolved in water , it undergoes mutarotation to form an equilibrium mixture of alpha - D glucose and beta - D glucose containing 63*6 % of the latter. Calculate K_(c) for the mutarotation.

    The alpha - D - glucose and beta- D - glucose differ from each other at one of the carbon atom due to difference in

    alpha -D-glucose and beta -D-glucose have a specific rotation of +112^(@) and +19^(@) respectively. In aqueous solution the rotation becomes +52^(@) . This is known as

    alpha-D glucose and beta-D -glucose differ from each other due to the difference in one of the carbon atoms, with respect to its.

    Consider the following statements fro monosaccharides (1) They are optically active polyhydroxy carbonyl compounds. (2) fructorse is a ketose sugar and hence it does not give red precipitate with Fehling solution. (3) All monosaccharides show mutarotation. (4) alpha - D - "Glucose" and beta-D-"Glucose" are anomers. Which one of the above statement (s) is/are correct ?

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