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Biomolecules

JEE Main 2026 (Online) 22nd January Evening ShiftMatchingEasy📈 Topic in 25% papers+4−1
Ques. 1JEE Main 2026, 22 January (Evening Shift)

Match List-I with List-II. Choose the correct answer from the options given below :

  1. A-IV, B-III, C-II, D-I
  2. A-I, B-III, C-IV, D-II
  3. A-III, B-I, C-IV, D-II
  4. A-IV, B-I, C-II, D-III

Answer

(4) A-IV, B-I, C-II, D-III

Solution

As per NCERT (reactions of glucose):

A. With hydroxylamine, the –CHO group forms an oxime glucoxime (IV)

CHO(CHOH)4CH2OH + NH2OH CH(=N-OH)(CHOH)4CH2OH + H2O

B. Bromine water (mild oxidant) oxidises –CHO to –COOH gluconic acid (I)

C. Excess acetic anhydride acetylates all five –OH groups glucose pentaacetate (II)

D. Concentrated HNO3 oxidises both –CHO and the terminal -CH2OH to –COOH saccharic acid (III)

A-IV, B-I, C-II, D-III

Answer: (4)

Keep practising — Biomolecules

Ques. 2JEE Main 2026, 21 January (Morning Shift)

Identify the correct statements. Choose the correct answer from the options given below :

  1. C and D Only
  2. A and D Only
  3. C and E Only
  4. B and E Only
Ques. 3JEE Main 2026, 21 January (Evening Shift)

The correct statements are : Choose the correct answer from the options given below :

  1. A, B and D Only
  2. A, C and D Only
  3. B and C Only
  4. A and B Only
Ques. 4JEE Main 2025, 8 April (Evening Shift)

[figure] Choose the correct option for structures of A and B, respectively

  1. [figure] and [figure]
  2. [figure] and [figure]
  3. [figure] and [figure]
  4. [figure] and [figure]
Ques. 5JEE Main 2025, 7 April (Morning Shift)

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below

  1. Both Statement I and Statement II are false
  2. Statement I is false but Statement II is true
  3. Both Statement I and Statement II are true
  4. Statement I is true but Statement II is false
Ques. 6JEE Main 2025, 7 April (Evening Shift)

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Statement I is incorrect but Statement II is correct
  2. Both Statement I and Statement II are incorrect
  3. Both Statement I and Statement II are correct
  4. Statement I is correct but Statement II is incorrect
Ques. 7JEE Main 2025, 4 April (Morning Shift)

Identify the pair of reactants that upon reaction, with elimination of HCl will give rise to the dipeptide Gly-Ala.

  1. NH2-CH2-COOH and NH2- CH3 |CH-COOH
  2. NH2-CH2-COCl and NH3- CH3 |CH-COCl
  3. NH2-CH2-COCl and NH2- CH3 |CH-COOH
  4. NH2-CH2-COOH and NH2- CH3 |CH-COCl
Ques. 8JEE Main 2025, 4 April (Morning Shift)

The total number of hydrogen bonds of a DNA-double Helix strand whose one strand has the following sequence of bases is . 5'-G-G-C-A-A-A-T-C-G-G-C-T-A-3'

Ques. 9JEE Main 2025, 4 April (Evening Shift)

A dipeptide, "x" on complete hydrolysis gives "y" and "z". "y" on treatment with aq. HNO2 produces lactic acid. On the other hand "z" on heating gives the following cyclic molecule. [figure] Based on the information given, the dipeptide "x" is :

  1. alanine-alanine
  2. valine-glycine
  3. valine-leucine
  4. alanine-glycine
Ques. 10JEE Main 2025, 3 April (Morning Shift)

Which of the following is the correct structure of L-Fructose?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 11JEE Main 2025, 3 April (Evening Shift)

Fat soluble vitamins are: Choose the correct answer from the options given below:

  1. B & C Only
  2. C & D Only
  3. C & E Only
  4. A & B Only

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