Atomos Test Generator Free PYQs ExamsMy practice Log in / Sign up free

Biomolecules

JEE Main 2026 (Online) 8th April Evening ShiftMCQEasy📈 Topic in 17% papers+4−1
Ques. 1JEE Main 2026, 8 April (Evening Shift)

Which of the following amino acid will give violet coloured complex with neutral ferric chloride solution?

  1. Threonine
  2. Serine
  3. Tyrosine
  4. Cysteine

Answer

(3) Tyrosine

Solution

Neutral FeCl3 gives a violet colour with a phenolic –OH group (test for phenols).

Tyrosine, HO-C6H4-CH2-CH(NH2)-COOH, has a phenolic –OH ⇒ violet complex.

Threonine and serine have alcoholic –OH and cysteine has –SH ⇒ no violet colour.

Answer: (3)

Keep practising — Biomolecules

Ques. 2JEE Main 2026, 6 April (Morning Shift)

Match the List-I with List-II

  1. A-I, B-III, C-II, D-IV
  2. A-I, B-III, C-IV, D-II
  3. A-III, B-I, C-IV, D-II
  4. A-III, B-I, C-II, D-IV
Ques. 3JEE Main 2026, 6 April (Morning Shift)

Match the List-I with List-II

  1. A-IV, B-II, C-I, D-III
  2. A-IV, B-I, C-II, D-III
  3. A-III, B-II, C-I, D-IV
  4. A-IV, B-I, C-III, D-II
Ques. 4JEE Main 2026, 6 April (Evening Shift)

Consider the following reactions. Total number of electrons in the π bonds and lone pair of electrons in the product (X) is : [figure]

  1. 12
  2. 16
  3. 14
  4. 18
Ques. 5JEE Main 2026, 5 April (Morning Shift)

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

  1. A and B Only
  2. B and C Only
  3. A, B and D Only
  4. A, B and E Only
Ques. 6JEE Main 2026, 5 April (Evening Shift)

Identify the incorrect statement about tertiary structure of proteins.

  1. They can be fibrous or globular in structure.
  2. The main forces that stabilize the structure are hydrogen bonding, disulphide links, van der Waals and electrostatic forces of attraction.
  3. The structure remains intact when exposed to pH changes.
  4. A linear polypeptide chain will convert to a secondary structure and then further folding of the secondary structure will convert to tertiary structure.
Ques. 7JEE Main 2026, 5 April (Evening 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 true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
Ques. 8JEE Main 2026, 4 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 true
  2. Both Statement I and Statement II are false
  3. Statement I is true but Statement II is false
  4. Statement I is false but Statement II is true
Ques. 9JEE Main 2026, 4 April (Morning Shift)

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

  1. A-II, B-I, C-IV, D-III
  2. A-IV, B-III, C-II, D-I
  3. A-III, B-IV, C-I, D-II
  4. A-II, B-IV, C-I, D-III
Ques. 10JEE Main 2026, 4 April (Evening Shift)

A D-aldotetrose on oxidation with concentrated HNO3 resulted in optically inactive dicarboxylic acid. The structure of the D-aldotetrose is:

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 11JEE Main 2026, 2 April (Morning Shift)

Match List - I with List - II.

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

All Biomolecules PYQs →

PDFDownload Biomolecules PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All JEE Main Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolid StateSolutionsElectrochemistryChemical Kinetics
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular Structures-Block Elementsp-Block Elements (Group 13 & 14)Environmental ChemistryGeneral Principles of Isolation of Elementsp-Block Elements (Group 15–18)d- and f-Block ElementsCoordination Compounds
Organic ChemistryOrganic Chemistry – Some Basic Principles and TechniquesIsomerismHydrocarbonsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomoleculesPrinciples Related to Practical Chemistry