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Why do monosaccharides form cyclic struc...

Why do monosaccharides form cyclic structures?

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### Step-by-Step Solution: 1. **Understanding Monosaccharides**: Monosaccharides are the simplest form of carbohydrates, consisting of single sugar units. They can exist in linear (open-chain) forms or cyclic (ring) forms. 2. **Presence of Functional Groups**: Monosaccharides contain functional groups such as aldehyde (-CHO) or ketone (C=O) groups, along with hydroxyl (-OH) groups. 3. **Intramolecular Reaction**: The cyclic structure is formed due to an intramolecular reaction. The hydroxyl group (-OH) on one of the carbons reacts with the carbonyl group (aldehyde or ketone) present in the same molecule. ...
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Knowledge Check

  • Which one of the following sets of monosaccharides forms sucrose ?

    A
    `alpha`-D- galactopyranose and `alpha`-D-glucophyranose
    B
    `alpha`-D-glucopyranose and `beta`-D-fructofuranose
    C
    `alpha`-D-glucopyranose and `beta`-D-fructopyranose
    D
    `alpha`-glucopyranose and `beta`-D-fructopyranose

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