COMPASSLearning
RegisterLogin

JEE Main · 2026 · 04 Apr 2026 · Shift 1 · Biomolecules

WhatsApp Email
Statement-I : The structure of Maltose is given below :

(structure shown)

Statement-II : The structure of Lactose is given below

(structure shown)

In the light of the above statements, choose the correct answer from the options given below
  1. (A)Both Statement I and Statement II are true
  2. (B)Both Statement I and Statement II are false
  3. (C)Statement I is true but Statement II is false
  4. (D)Statement I is false but Statement II is true✓ Correct

Answer: (D)

Solution

Maltose is two glucose units joined by an glycosidic linkage, leaving the anomeric carbon of the second glucose as a free hemiacetal, so maltose is a reducing sugar. The structure in Statement I is labelled a non-reducing sugar, which is wrong, so Statement I is false. Lactose is galactose joined to glucose by a linkage with a free hemiacetal on the glucose unit, so it is a reducing sugar, exactly as drawn in Statement II, so Statement II is true. Hence Statement I is false while Statement II is true.

JEE Main · 2026 · 04 Apr 2026 · Shift 1 · Single correct option

Practise more: all JEE Main PYQs on Biomolecules →

More JEE Main questions on Biomolecules

  1. Identify the correct statements.

    A. Arginine and Tryptophan are essential amino acids.
    B. Histidine does not contain heterocyclic ring in its structure.
    C. Proline is a six membered cyclic ring amino acid.
    D. Glycine does not have chiral centre.
    E. Cysteine has characteristic fe …
    JEE Main 2026View solution →
  2. Given below are two statements:

    Statement I: Sucrose is dextrorotatory. However sucrose upon hydrolysis gives a solution having mixture of products. This solution shows laevorotation.

    Statement II : Hydrolysis of sucrose gives glucose and fructose. Since the laevorotation of gl …
    JEE Main 2026View solution →
  3. The correct statements are:
    A. Activation energy for enzyme catalysed hydrolysis of sucrose is lower than that of acid catalysed hydrolysis.
    B. During denaturation, secondary and tertiary structures of a protein are destroyed but primary structure remains intact.
    C. Nucleotides a …
    JEE Main 2026View solution →
  4. Match List-I with List-II.

    List-I
    Reaction of glucose with
    A. Hydroxylamine
    B. water
    C. Excess acetic anhydride
    D. Concentrated

    List-II
    Product formed
    I. Glouconic acid
    II. Glucose pentacetate
    III. Saccharic acid
    IV. Glucoxime

    Choose th …
    JEE Main 2026View solution →
  5. Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of
    JEE Main 2026View solution →
  6. The number of possible tripeptides formed involving alanine (ala), glycine (gly) and valine (val), where no amino acid has been used more than once is :
    JEE Main 2026View solution →