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Chemistry - Hydrocarbons

Practise 42 WBJEE previous year questions on Hydrocarbons, compiled from papers spanning 2009 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 WBJEE tests.

Hydrocarbons has been asked in 16 of the 18 years of WBJEE papers analysed (2009–2026), with 42 questions in all. 33% of them were easy, 48% moderate and 19% tough. Most of its questions came from 2026, with 4 questions that year. In the last three years (2024–2026) it had 7 questions across 3 papers, about 2.3 per paper.

The chapter's 9 topics are not weighted equally: Reactions of alkenes (13 questions, 31%), Reactions of aromatic compounds (12 questions, 29%), and Reactions of alkynes (4 questions, 10%) have been asked the most. Reactions of alkenes has also led over the last five years, with 2 questions. Reactions of aromatic compounds has produced the most tough questions (4).

  1. 1In the following reaction sequence, the product is2026Properties and Preparation of Alkenes
  2. 2The products and in the following reaction sequence are2026Reactions of Benzene
  3. 3In the following sequence of reactions, what is the end product ' '?2026Properties and Preparation of Alkynes
  4. 4To carry out the above conversion and are respectively2026Reactions of alkynes
  5. 5In optically active alkene having molecular formula gives acetone as one of the products on ozonolysis. The structure of the alkene is2025Reactions of alkenes
  6. 6Identify the major product in the following reaction2025Reactions of aromatic compounds
  7. 7Which of the following hydrocarbons reacts easily with MeMgBr to give methane?2025Reactions of alkynes
  8. 8The correct set(s) of reactions to synthesize benzoic acid starting from benzene is/are2023Reactions of aromatic compounds
  9. 9How many monobriminated product(s) (including stereoisomers) would form in the free radical bromination of nbutane?2022Reactions of alkanes
  10. 10The major product of the following reaction is2022Reactions of alkenes
  11. 11The product of the following hydrogenation reaction is:2022Preparation and Reactions of cycloalkanes and cycloalkenes
  12. 12The above conversion can be carried out by,2022Properties and Preparation of Alkanes
  13. 13The exact order of boiling points of the compounds -pentane, isopentane, butanone and 1 -butanol is2021Properties and Preparation of Alkanes
  14. 14The total number of alkyl bromides (including stereoismers) formed in the reaction will be2020Reactions of alkenes
  15. 15Which of the following reactions give(s) a meso-compound as the main product?2020Reactions of alkenes
  16. 16The product (s) from the above reaction will be2020Reactions of alkenes
  17. 17Haloform reaction with and will be responded by2019Properties and Preparation of Alkynes
  18. 18can be prepared by the reaction of2018Properties and Preparation of Alkynes
  19. 19The number of alkene (s) which can produce 2 -butanol by the successive treatment of (i) in tetrahydrofuran solvent and (ii) alkaline soluti2018Reactions of alkenes
  20. 20The major products obtained in the following reaction is/are2018Reactions of alkenes
  21. 21The isomerisation of 1 -butyne to 2 -butyne can be achieved by treatment with2017Reactions of alkynes
  22. 22The major product(s) obtained form the following reaction of 1 mole of hexadeuteriobenzene is/are2017Reactions of aromatic compounds
  23. 23Ozonolysis of an alkene produces only one dicarbonyl compound. The structure of the alkene is2016Reactions of alkenes
  24. 24The major products obtained during ozonolysis of 2,3 -dimethyl- 1 -butene and subsequent reductions with and àte2016Reactions of alkenes
  25. 25The major product of the above reaction is2015Reactions of alkenes
  26. 261,4 -dimethylbenzene on heating with anhydrous and HCl produces2015Reactions of aromatic compounds
  27. 27Best reagent for nuclear iodination of aromatic compounds is2015Reactions of aromatic compounds
  28. 28ldentify the correct method for the synthesis of lhe compound shown below from the following alternatives.2015Reactions of aromatic compounds
  29. 29An optically active compound having molecular formula on ozonolysis gives acetone as one of the products. The structure of the compound is2013Reactions of alkenes
  30. 30The best method for the preparation of 2, 2-dimethylbutane is via the reaction of2013Properties and Preparation of Alkanes
  31. 31Reaction of benzene with in the presence of anhydrous AlCl gives2013Reactions of aromatic compounds
  32. 32Correct statement(s) in cases of -butanol and -butanol is (are)2013Properties and Preparation of Alkanes
  33. 33By passing excess in boiling toluene, which one of the following compounds is exclusively formed?2012Reactions of aromatic compounds
  34. 34An equimolar mixture of toluene and chlorobenzene is treated with a mixture of conc. and conc. . Indicate the correct statement from the fol2012Reactions of aromatic compounds
  35. 35Two aromatic compounds having formula \( {C}_7 {H}_8 {O}\) which are easily identifiable by \( {FeCl}_3\) solution test (violet colouration)2011Reactions of aromatic compounds
  36. 36The ease of dehydrohalogenation of alkyl halide with alcoholic \( {KOH}\) is2011Properties and Preparation of Alkenes
  37. 37The ease of Nitration of the following three hydrocarbons follows the order2011Reactions of aromatic compounds
  38. 38Among the alkenes which one produces tertiary bytyl alcohol on acid hydration2011Reactions of alkenes
  39. 39On mixing an alkane with chlorine and irradiating with ultra-violet light, it forms only one mono-chloro-alkane. The alkane is2010Reactions of alkanes
  40. 40What is obtained when nitrobenzene is treated sequentially with (i) dust and (ii) ?2010Reactions of aromatic compounds
  41. 41The addition of to 2-pentene gives2009Reactions of alkenes
  42. 42Ethelene can be separated from acetylene by passing the mixture through :2009Reactions of alkynes

Frequently Asked Questions

1.How many questions are available for Hydrocarbons?

This chapter includes 42 questions compiled from WBJEE papers spanning 2009 to 2026.

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

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

3.Is Hydrocarbons an important chapter for WBJEE Chemistry?

Hydrocarbons has appeared in 16 of the 18 years of WBJEE papers covered here, with 42 questions across 16 papers - about 3 per paper it appears in.

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

Of the 42 questions analysed for this chapter, 33% are easy, 48% moderate and 19% tough. 2026 had the most, with 4 questions.

5.Which topics in Hydrocarbons should I focus on?

These topics have carried the most weightage in Hydrocarbons:

  • Reactions of alkenes - 13 questions (31%)
  • Reactions of aromatic compounds - 12 questions (29%)
  • Reactions of alkynes - 4 questions (10%)
  • Reactions of aromatic compounds has produced the most tough questions (4).
6.Is Hydrocarbons's weightage in WBJEE going up or down?

Across all 16 papers analysed, Hydrocarbons has averaged about 2.6 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 2.3 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.