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Chemistry - Biomolecules

Practise 25 JEE Advanced previous year questions on Biomolecules, compiled from papers spanning 2007 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty JEE Advanced tests.

Biomolecules has been asked in 19 of the 27 years of JEE Advanced papers analysed (2000–2026), with 25 questions in all. 16% of them were easy, 48% moderate and 36% tough. Most of its questions came from 2026, with 3 questions that year. In the last three years (2024–2026) it had 5 questions across 6 papers, about 0.8 per paper.

The chapter's 5 topics are not weighted equally: Carbohydrates (8 questions, 32%), Properties and Preparation of Amino Acids (8 questions, 32%), and Disaccharides and Polysaccharides (5 questions, 20%) have been asked the most. Over the last five years the most frequent topics have been Disaccharides and Polysaccharides (2), Carbohydrates (2), and Preparation and Reactions of Glucose (1). Properties and Preparation of Amino Acids has produced the most tough questions (4).

  1. 1A known artificial sweetener is composed of 4-chloro-4-deoxy- -D-galactose and 1,6-dichloro-1,6-dideoxy- -D-fructose joined by a glycosidic 2026 (Paper 2)Carbohydrates
  2. 2The correct statement(s) regarding sugars is(are) Given: Specific rotations of L-( )-glucose and L-( )-fructose are and , respectively.2026 (Paper 2)Carbohydrates
  3. 3In the following reaction sequence, major products and are acyclic monomers. mol of completely reacts with mol of to give mol of a single bi2026 (Paper 2)Properties and Preparation of Amino Acids
  4. 4A linear octasaccharide (molar mass ) on complete hydrolysis produces three monosaccharides: ribose, 2-deoxyribose and glucose. The amount o2025 (Paper 2)Disaccharides and Polysaccharides
  5. 5For a double strand DNA, one strand is given below: The amount of energy required to split the double strand DNA into two single strands is 2024 (Paper 2)Nucleic Acids
  6. 6A disaccharide X cannot be oxidised by bromine water. The acid hydrolysis of X leads to a laevorotatory solution. The disaccharide X is2023 (Paper 2)Disaccharides and Polysaccharides
  7. 7Treatment of D -glucose with aqueous NaOH results in a mixture of monosaccharides, which are2022 (Paper 2)Preparation and Reactions of Glucose
  8. 8Given: The compound s , which on reaction with HNO 3 will give the product having degree of rotation, D = 52 .7 is (are)2021 (Paper 1)Carbohydrates
  9. 9The structure of a peptide is given below. If the absolute values of the net charge of the peptide at pH = 2 , pH = 6 , and pH = 11 are z 1 2020 (Paper 2)Properties and Preparation of Amino Acids
  10. 10Which of the following statement(s) is(are) true?2019 (Paper 1)Preparation and Reactions of Glucose
  11. 11The Fischer presentation of D-glucose is given below The correct structure(s) of β - L - glucopyranose is (are)2018 (Paper 2)Carbohydrates
  12. 12For invert sugar , the correct statement(s) is (are) (Given: specific rotations of + - sucrose, + - maltose, L - - - glucose and L - + - fru2016 (Paper 2)Disaccharides and Polysaccharides
  13. 13Paragraph: Treatment of compound with gave , which on heating with ammonia gave . The compound on treatment with produced . On strong heatin2016 (Paper 2)Properties and Preparation of Amino Acids
  14. 14The structure of D - + - g l u c o s e is The structure of L - - - g l u c o s e is2015 (Paper 1)Carbohydrates
  15. 15The total number of distinct naturally occurring amino acids obtained by complete acidic hydrolysis of the peptide shown below is2014 (Paper 1)Properties and Preparation of Amino Acids
  16. 16A tetrapeptide has -COOH group on alanine. This produces glycine (Gly), Valine (Val), Phenyl alanine (Phe) and Alanine (Ala) on complete hyd2013 (Paper 1)Properties and Preparation of Amino Acids
  17. 17When the following aldohexose exists in its D-configuration, the total number of stereoisomers in its pyranose form is :2012 (Paper 1)Carbohydrates
  18. 18The substituents and for nine peptides are listed in the table given below. How many of these peptides are positively charged at ? {array}{|2012 (Paper 1)Properties and Preparation of Amino Acids
  19. 19A decapeptide (molecular weight 796) on complete hydrolysis gives glycine (molecular weight 75), alanine and phenylalanine. Glycine contribu2011 (Paper 1)Properties and Preparation of Amino Acids
  20. 20The following carbohydrate is2011 (Paper 2)Carbohydrates
  21. 21The correct statement about the following disaccharide is2010 (Paper 1)Disaccharides and Polysaccharides
  22. 22The total number of basic groups in the following form of lysine is2010 (Paper 1)Properties and Preparation of Amino Acids
  23. 23The correct statement(s) about the following sugars and is (are)2009 (Paper 2)Carbohydrates
  24. 24Cellulose upon acetylation with excess acetic anhydride (catalytic) gives cellulose triacetate whose structures is2008 (Paper 2)Disaccharides and Polysaccharides
  25. 25Statement I Glucose gives a reddish-brown precipitate with Fehling's solution. Statement II Reaction of glucose with Fehling's solution give2007 (Paper 2)Preparation and Reactions of Glucose

Frequently Asked Questions

1.How many questions are available for Biomolecules?

This chapter includes 25 questions compiled from JEE Advanced papers spanning 2007 to 2026.

2.Are these questions only from JEE Advanced, or from other exams too?

These are JEE Advanced questions specifically for the Biomolecules chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.

3.Is Biomolecules an important chapter for JEE Advanced Chemistry?

Biomolecules has appeared in 19 of the 21 years of JEE Advanced papers covered here, with 25 questions across 20 papers - about one per paper it appears in.

4.What is the difficulty level of Biomolecules questions in JEE Advanced?

Of the 25 questions analysed for this chapter, 16% are easy, 48% moderate and 36% tough. 2026 had the most, with 3 questions.

5.Which topics in Biomolecules should I focus on?

These topics have carried the most weightage in Biomolecules:

  • Carbohydrates - 8 questions (32%)
  • Properties and Preparation of Amino Acids - 8 questions (32%)
  • Disaccharides and Polysaccharides - 5 questions (20%)
  • Properties and Preparation of Amino Acids has produced the most tough questions (4).
6.Is Biomolecules's weightage in JEE Advanced going up or down?

Across all 20 papers analysed, Biomolecules has averaged about 1.3 questions per paper. In the last three years (2024–2026), that average has fallen, at about 0.8 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.