COMPASSLearning
RegisterLogin

CBSE Class 12 · 2005 · Foreign · BiomoleculesShort Answer

WhatsApp Email
Write the chemical equations for the reactions of glucose with:
i) acetic anhydride
ii) NH₂OH
Also draw the Fischer projections of D-glucose and L-glucose.

Solution

(i)

(ii)
(the oxime).
Fischer projections: write the chain CHO (top) to CHOH (bottom). In \textbf{D-glucose} the –OH groups sit right-left-right-right on C-2→C-5; \textbf{L-glucose} is its full mirror image (every –OH switched side, C-5 –OH now on the left).

CBSE Class 12 Board · 2005 · Foreign · Subjective

Practise more: all CBSE board PYQs on Biomolecules →

More board questions on Biomolecules

  1. The specific sequence in which amino acids are arranged in a protein is called its:
    CBSE 2024View solution →
  2. Classify the following sugars into monosaccharides and disaccharides: galactose, glucose, lactose and maltose.
    CBSE 2024View solution →
  3. Case study — Vitamins: certain organic compounds required in small amounts in our diet whose deficiency causes specific diseases. Most vitamins cannot be synthesised in our body, but plants can synthesise almost all of them; gut bacteria produce some. The term 'vitamin' was coine …
    CBSE 2024View solution →
  4. Case study — Vitamins (same passage as above).
    OR (c) Why can't vitamin C be stored in our body? Name the disease caused by the deficiency of this vitamin.
    CBSE 2024View solution →
  5. Give the reaction of glucose with acetic anhydride. Which group's presence is confirmed by this reaction?
    CBSE 2023View solution →
  6. Give reasons for any three of the following observations:
    a) The pentaacetate of glucose does not react with hydroxylamine.
    b) Amino acids behave like salts.
    c) Water-soluble vitamins must be taken regularly in the diet.
    d) The two strands in DNA are complementary to each other.
    CBSE 2023View solution →