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Chemistry - Hydrocarbons

Practise 242 JEE Main previous year questions on Hydrocarbons, compiled from papers spanning 2004 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 Main tests.

Hydrocarbons has been asked in 21 of the 25 years of JEE Main papers analysed (2002–2026), with 242 questions in all. 14% of them were easy, 59% moderate and 27% tough. Most of its questions came from 2021, with 38 questions that year. In the last three years (2024–2026) it had 64 questions across 49 papers, about 1.3 per paper.

The chapter's 11 topics are not weighted equally: Reactions of alkenes (72 questions, 30%), Reactions of aromatic compounds (66 questions, 27%), and Reactions of alkanes (23 questions, 10%) have been asked the most. Reactions of alkenes has also led over the last five years, with 35 questions. Reactions of alkenes has produced the most tough questions (19).

  1. 1value for -methylpropene in a solvent system (Ethyl acetate + ether) is . -methylpropene is treated with dilute to give major organic produc06 Apr, 2026 (M)Reactions of alkenes
  2. 2Given below are two statements: Statement I: Methane can be prepared by decarboxylation of sodium ethanoate, Kolbe's electrolysis of sodium 06 Apr, 2026 (M)Properties and Preparation of Alkanes
  3. 3Given below are two statements: Statement I: -phenylpropene reacts with HBr and gives secondary alkyl bromide having a chiral carbon atom as06 Apr, 2026 (M)Reactions of alkenes
  4. 4An optically active alkyl bromide C H Br, reacts with ethanolic KOH to form major compound [A] which reacts with bromine to give compound [B06 Apr, 2026 (E)Reactions of alkynes
  5. 5An alkane requires moles of oxygen for complete combustion and on chlorination with Cl /h , gives only one monochlorinated product . The tot06 Apr, 2026 (E)Reactions of alkanes
  6. 6"P" is a hydrocarbon of molecular formula: C H . On ozonolysis, "P" forms "Q". "Q" on treatment with alkali under reflux condition produces 05 Apr, 2026 (M)Reactions of alkenes
  7. 7For the following Friedel Craft's alkylation reaction, which of the statements are correct? A. Major product is n-propyl benzene. B. iso-pro05 Apr, 2026 (M)Reactions of aromatic compounds
  8. 8IUPAC name of the some alkenes are given below. Find out the correct stability order. A. 2-Methylbut-2-ene B. cis-But-2-ene C. 2,3-Dimethylb05 Apr, 2026 (E)Properties and Preparation of Alkenes
  9. 9An alkene on ozonolysis followed by reduction gives following products: ( moles), , . The alkene is:04 Apr, 2026 (M)Reactions of alkenes
  10. 10Consider the following sequence of reactions to give the major product g of the major product formed is reacted with solution to liberate a 04 Apr, 2026 (M)Reactions of aromatic compounds
  11. 11Compound (X) [styrene] is subjected to the sequence of reactions as shown above: (i) (ii) excess (iii) (iv) , , giving Major Product (Y). Mo04 Apr, 2026 (E)Reactions of alkenes
  12. 12For the given molecule, " ", the preferred site for the attack of the electrophile is :02 Apr, 2026 (M)Reactions of aromatic compounds
  13. 13Consider the isomers of hydrocarbon with molecular formula . These isomers do not decolourise solution. These isomers are subjected to chlor02 Apr, 2026 (M)Preparation and Reactions of cycloalkanes and cycloalkenes
  14. 14One mole of an alkane (x) requires mole oxygen for complete combustion. Sum of number of carbon and hydrogen atoms in the alkane (x) is ____02 Apr, 2026 (M)Reactions of alkanes
  15. 15The compound (X) on (i) on heating in the presence of anhydrous and HCl gas gives -dimethyl pentane (ii) aromatization gives toluene and (ii02 Apr, 2026 (E)Reactions of alkanes
  16. 16Identify compounds A and E in the following reaction sequence.02 Apr, 2026 (E)Reactions of aromatic compounds
  17. 17Product Consider the above reaction A. The reaction proceeds through a more stable radical intermediate. B. The role of peroxide is to gener28 Jan, 2026 (M)Reactions of alkenes
  18. 18Method used for separation of mixture of products (B and C) obtained in the following reaction is28 Jan, 2026 (M)Reactions of aromatic compounds
  19. 19Given below are two statements for the following reaction sequence. Statement I: Compound ' ' will give yellow precipitate with NaOI. Statem28 Jan, 2026 (M)Reactions of alkynes
  20. 20Identify the correct statements : The presence of group in benzene ring A. activates the ring towards electrophilic substitutions. B. deacti28 Jan, 2026 (E)Reactions of aromatic compounds
  21. 21Consider the following compounds Arrange these compounds in the increasing order of reactivity with nitrating mixture.23 Jan, 2026 (M)Reactions of aromatic compounds
  22. 22But-2-yne and hydrogen (one mole each) are separately treated with (i) and (ii) to give the products X and Y respectively. Identify the inco23 Jan, 2026 (M)Properties and Preparation of Alkynes
  23. 23Identify (P)23 Jan, 2026 (E)Reactions of alkenes
  24. 24Consider the following reaction of benzene. In compound (Q), the percentage of oxygen is %. (Nearest integer)23 Jan, 2026 (E)Reactions of aromatic compounds
  25. 25Given below are two statements: Statement I : Benzene is nitrated to give nitrobenzene, which on further treatment with will give Statement 22 Jan, 2026 (M)Reactions of aromatic compounds
  26. 26The cycloalkene on bromination consumes one mole of bromine per mole of and gives the product in which ratio is 3:1. The percentage of bromi22 Jan, 2026 (M)Reactions of alkenes
  27. 27Consider the following reaction : The product Y formed is :22 Jan, 2026 (E)Reactions of alkynes
  28. 28Identify A in the following reaction.21 Jan, 2026 (M)Reactions of alkenes
  29. 29Preview not available - open to view this question.08 Apr, 2025 (E)Reactions of aromatic compounds
  30. 30Given below are two statements : Statement I : Ozonolysis followed by treatment with of cis-2-butene gives ethanal. Statement II : The produ07 Apr, 2025 (M)Reactions of alkenes
  31. 31The number of optically active products obtained from the complete ozonolysis of the given compound is :07 Apr, 2025 (E)Reactions of alkenes
  32. 32Identify the structure of the final product (D) in the following sequence of the reactions : Total number of hybridised carbon atoms in prod07 Apr, 2025 (E)Reactions of alkynes
  33. 33Benzene is treated with oleum to produce compound (X) which when further heated with molten sodium hydroxide followed by acidification produ04 Apr, 2025 (M)Reactions of aromatic compounds
  34. 34Consider the following molecule (X). The structure of X is04 Apr, 2025 (E)Reactions of alkenes
  35. 350.5 g of an organic compound on combustion gave 1.46 g of and 0.9 g of . The percentage of carbon in the compound is _______. (Nearest integ03 Apr, 2025 (M)Reactions of alkanes
  36. 36Which compound would give 3-methyl-6oxoheptanal upon ozonolysis?03 Apr, 2025 (M)Reactions of Benzene
  37. 37X g of nitrobenzene on nitration gave 4.2 g of m-dinitrobenzene. ______ g. (nearest integer) [Given : molar mass (in ) ,03 Apr, 2025 (E)Reactions of aromatic compounds
  38. 38In the following series of reactions identify the major products A \& B respectively.03 Apr, 2025 (E)Reactions of aromatic compounds
  39. 39Given below are two statements : Statement (I) : Neopentane forms only one monosubstituted derivative. Statement (II) : Melting point of neo02 Apr, 2025 (E)Properties and Preparation of Alkanes
  40. 40In the following substitution reaction: product \({ }^{ } {P}^{ }\) formed is :29 Jan, 2025 (M)Reactions of aromatic compounds
  41. 41Which one of the following reaction sequences will give an azo dye?29 Jan, 2025 (E)Reactions of aromatic compounds
  42. 42Given below are two statements : Statement (I) : On nitration of m-xylene with followed by oxidation, 4-nitrobenzene-1,3-dicarboxylic acid i29 Jan, 2025 (E)Reactions of alkanes
  43. 43Which among the following halides will generate the most stable carbocation in the nucleophilic substitution reaction?29 Jan, 2025 (E)Reactions of aromatic compounds
  44. 44Isomeric hydrocarbons negative Baeyer's test (Molecular formula ) The total number of isomers from above with four different non-aliphatic s29 Jan, 2025 (E)Reactions of alkynes
  45. 45Identify product and in the following reaction sequence.28 Jan, 2025 (E)Reactions of alkynes
  46. 46The product formed in the following reaction sequence is :28 Jan, 2025 (E)Reactions of aromatic compounds
  47. 47The major product of the following reaction is :28 Jan, 2025 (E)Reactions of aromatic compounds
  48. 48The product (A) formed in the following reaction sequence is24 Jan, 2025 (M)Reactions of alkynes
  49. 49Following are the four molecules "P", "Q", "R" and "S". Which one among the four molecules will react with at the fastest rate?24 Jan, 2025 (M)Reactions of alkanes
  50. 50Match the LIST-I with LIST-II Choose the correct answer from the options given below:23 Jan, 2025 (M)Reactions of alkanes

Frequently Asked Questions

1.How many questions are available for Hydrocarbons?

This chapter includes 242 questions compiled from JEE Main papers spanning 2004 to 2026.

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

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

3.Is Hydrocarbons an important chapter for JEE Main Chemistry?

Hydrocarbons has appeared in 21 of the 25 years of JEE Main papers covered here, with 242 questions across 148 papers - about 2 per paper it appears in.

4.What is the difficulty level of Hydrocarbons questions in JEE Main?

Of the 242 questions analysed for this chapter, 14% are easy, 59% moderate and 27% tough. 2021 had the most, with 38 questions.

5.Which topics in Hydrocarbons should I focus on?

These topics have carried the most weightage in Hydrocarbons:

  • Reactions of alkenes - 72 questions (30%)
  • Reactions of aromatic compounds - 66 questions (27%)
  • Reactions of alkanes - 23 questions (10%)
  • Reactions of alkenes has produced the most tough questions (19).
6.Is Hydrocarbons's weightage in JEE Main going up or down?

Across all 148 papers analysed, Hydrocarbons has averaged about 1.6 questions per paper. In the last three years (2024–2026), that average has fallen, at about 1.3 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.