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Class 11 Chemistry — Chapter 13: Hydrocarbons Online Test

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Class 11 Chemistry: Hydrocarbons Online Test (Paper 1)

Welcome to Paper 1! This is your foundation to build confidence and get you ready to tackle the challenges ahead.

  • Total Questions: 20
  • Time Allotted: 30 minutes
  • Passing Score: 40%
  • Randomization: No
  • Certificate: No
  • Retake: Allowed
  • Price: 100% Free

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1 / 20

1. The term "polynuclear" in refers to the presence of:

2 / 20

2. The primary reason the Methyl group () is an activating and -directing group is its ability to donate electrons via:

3 / 20

3. When the product of a Friedel–Crafts acylation () is treated with and concentrated (Clemmensen Reduction), the final product obtained is a:

4 / 20

4. The final step in the halogenation mechanism is the regeneration of the catalyst and the aromatic ring. This involves the removal of which species from the complex?

5 / 20

5. In the reaction , the bond of the benzene ring is broken, and a new bond is formed. This step is a characteristic of:

6 / 20

6. The overall nitration reaction is written as: . How is this reaction classified in terms of heat change?

7 / 20

7. The initial slow step in the mechanism of benzene nitration involves the attack of the electrophile on the benzene ring to form:

8 / 20

8. The addition of water () to Ethyne () in the presence of and yields an intermediate enol, which quickly tautomerizes to form the final product:

9 / 20

9. After an alkyne salt () is formed using , how is the neutral terminal alkyne () typically regenerated?

10 / 20

10. Starting with 1,1-Dichloropropane and performing double dehydrohalogenation, what is the final alkyne product?

11 / 20

11. The carbon atoms involved in the triple bond of an alkyne are linked by which combination of bonds?

12 / 20

12. Ozonolysis of an unknown alkene yields () and (). Identify the structure of the starting alkene.

13 / 20

13. Halogenation of an alkene with or results in the formation of which type of product?

14 / 20

14. The conversion of a vicinal dihalide () to an alkene requires treatment with:

15 / 20

15. The compound 2,3-Dimethylbut-2-ene does not show geometrical isomerism because:

16 / 20

16. The two carbon atoms involved in the double bond of an alkene are linked by which combination of bonds?

17 / 20

17. Decarboxylation is considered a useful method for:

18 / 20

18. What is the molecular formula for -Hexane?

19 / 20

19. What is the approximate bond length in a typical alkyne, such as Ethyne ()?

20 / 20

20. How many sigma () and pi () bonds are present in Propene ()?

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Class 11 Chemistry: Hydrocarbons Online Test (Paper 2)

Welcome to Paper 2! You’ve mastered the basics, and now it’s time to test your understanding with a more challenging set of questions.

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  • Total Questions: 30
  • Time Allotted: 45 minutes
  • Passing Score: 50%
  • Randomization: Yes
  • Certificate: No
  • Retake: Allowed
  • Price: 100% Free

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1 / 30

1. The lack of free rotation about a bond, as opposed to a bond, leads to which specific type of isomerism?

2 / 30

2. Aromatic hydrocarbons generally burn with a characteristic yellow, sooty flame. This is primarily due to:

3 / 30

3. What is the sum of the stoichiometric coefficients of and in the balanced chemical equation for the complete combustion of Pentane ()?

4 / 30

4. According to Hückel's Rule, which of the following -electron counts is characteristic of an anti-aromatic compound?

5 / 30

5. What is the IUPAC name of the product obtained when Ethyne reacts with excess Bromine water ( in )?

6 / 30

6. After an alkyne salt () is formed using , how is the neutral terminal alkyne () typically regenerated?

7 / 30

7. Which of the following is the standard reagent and catalyst system required for the chlorination of benzene?

8 / 30

8. Which of the following is a disadvantage of the Kolbe's electrolytic synthesis method for preparing alkanes?

9 / 30

9. Which set of reagents is used to convert an alkene to a corresponding alkane?

10 / 30

10. The sulfonation of benzene is best carried out using which reagent system to maximize the yield of benzenesulfonic acid?

11 / 30

11. The terminal hydrogen atom of ethyne () is acidic because the carbon atom involved is:

12 / 30

12. Polymerization is generally defined as a chemical process where:

13 / 30

13. What is the molecular formula for -Hexane?

14 / 30

14. What are the products of the ozonolysis of 2-Methylbut-2-ene ()?

15 / 30

15. The single bond length in propane is . This bond is formed by the overlap of which types of orbitals from the two adjacent carbon atoms?

16 / 30

16. What is the main limitation of the Wurtz reaction when attempting to prepare an unsymmetrical alkane, such as Propane?

17 / 30

17. What is the minimum number of carbon atoms required for a compound to be classified as an alkyne?

18 / 30

18. In the homologous series of alkanes, what is the increase in molar mass between two consecutive members?

19 / 30

19. What is the minimum number of carbon atoms required for an alkene to exhibit positional isomerism?

20 / 30

20. Which of the following compounds is an example of a polycyclic aromatic hydrocarbon (PAH) known for its high carcinogenic potential?

21 / 30

21. Consider the reaction where Benzoic Acid is treated with concentrated and . The major product formed is (W). What is the orientation of the group in (W)?

22 / 30

22. Which halogen reacts the fastest with methane in a free-radical substitution reaction?

23 / 30

23. What are the products of the complete combustion of any alkane in the presence of excess oxygen?

24 / 30

24. Terminal alkynes (e.g., Ethyne) are characterized by the presence of an acidic hydrogen atom. The acidity is primarily due to the:

25 / 30

25. Which reagent can be used to distinguish between a terminal alkyne (like Prop-1-yne) and an internal alkyne (like But-2-yne)?

26 / 30

26. Chain isomerism is not possible for which of the following simple alkanes?

27 / 30

27. Benzene is best represented by the resonance hybrid structure because:

28 / 30

28. The correct representation of the -electron system in Benzene according to the Modern Theory is:

29 / 30

29. Ozonolysis of Propene () followed by reductive workup yields which two main products?

30 / 30

30. A compound with the molecular formula can be either an alkene or a cycloalkane. This is an example of which type of isomerism?

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Class 11 Chemistry: Hydrocarbons Online Test (Paper 3)

Welcome to Paper 3! You’ve warmed up—now it's time to step up your game and conquer the challenge with tougher questions!

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  • Total Questions: 50
  • Time Allotted: 75 minutes
  • Passing Score: 70%
  • Randomization: Yes
  • Certificate: Yes
  • Retake: Allowed
  • Price: 100% Free

Good luck! 👍

1 / 50

1. Hydrocarbons containing carbon-carbon double bonds are classified as:

2 / 50

2. Which reaction is used to selectively form a cis-alkene from an alkyne?

3 / 50

3. Why are halogens (, ) unique among all substituents?

4 / 50

4. If 1-Chloropropane is used in the Wurtz reaction, what is the structure of the major alkane product formed?

5 / 50

5. The electrophilic substitution reactions are characteristic of aromatic compounds because:

6 / 50

6. Which of the following substrates will fail to undergo Friedel–Crafts acylation ()?

7 / 50

7. The second elimination step, converting a haloalkene into an alkyne, is often difficult because it removes a hydrogen from a carbon that is part of a double bond. What extremely strong base is required to complete this step, especially for terminal alkynes?

8 / 50

8. Which catalyst system is typically used in the industrial production of to create a highly linear polymer chain with minimal branching?

9 / 50

9. The conversion of a compound from the enol form to the keto form is an example of which specialized type of isomerism?

10 / 50

10. Which of the following compounds will not exhibit geometrical (cis-trans) isomerism?

11 / 50

11. Polynuclear Aromatic Hydrocarbons (PAHs) are primarily formed during:

12 / 50

12. Unlike the purely cationic sigma complexes formed in Nitration or Halogenation, the sigma complex intermediate formed during the Sulfonation of Benzene is best described as:

13 / 50

13. The initial step in the sulfonation of benzene involves the attack of the electrophile on the -cloud of benzene, forming an intermediate known as a:

14 / 50

14. When a substituent donates electrons to the ring via resonance, the electron density is primarily increased at which positions?

15 / 50

15. What is the principal functional group or structural feature that determines the suffix '-ene' in the IUPAC naming of an organic compound?

16 / 50

16. What is the IUPAC name of the product obtained when Ethyne reacts with excess Bromine water ( in )?

17 / 50

17. The resonance energy of Benzene, which quantifies its extra stability due to delocalization, is approximately:

18 / 50

18. If a substituted benzene ring like chlorobenzene is subjected to further chlorination, the second chlorine atom will predominantly substitute at the and positions. This is because:

19 / 50

19. In an electrophilic aromatic substitution reaction, a substituent already present on the benzene ring is categorized as an -director or a -director based on:

20 / 50

20. The free rotation about the single bond in alkanes leads to the existence of different spatial arrangements known as:

21 / 50

21. What is the number of sigma bonds in the molecule -Butane ()?

22 / 50

22. The product formed when sodium propanoate () is heated with soda lime ( and ) is:

23 / 50

23. In the reaction of Benzene with 1-Chloropropane and , the major product obtained is Isopropylbenzene (Cumene), not Propylbenzene. This is a direct consequence of:

24 / 50

24. What is the general molecular formula for acyclic alkynes containing one carbon-carbon triple bond?

25 / 50

25. What is the molecular formula for the straight-chain alkane known as Heptane?

26 / 50

26. Which of the following pair of compounds are chain isomers of Octane ()?

27 / 50

27. What is the hybridization state of the two carbon atoms involved in the double bond of an alkene?

28 / 50

28. Which of the following conditions is most suitable for the dehydrohalogenation of an alkyl halide ()?

29 / 50

29. If Nitrobenzene is subjected to further nitration, the incoming nitro group will predominantly substitute at which position?

30 / 50

30. Which of the following is a disadvantage of the Kolbe's electrolytic synthesis method for preparing alkanes?

31 / 50

31. When Methane is heated with oxygen at high pressure () in the presence of Copper () catalyst, the primary product is:

32 / 50

32. Which conformer of Ethane () represents the state of maximum stability and minimum energy?

33 / 50

33. A cyclic, planar, fully conjugated system that contains electrons (e.g., electrons) is classified as:

34 / 50

34. Which product is formed when is added to a terminal alkyne like Prop-1-yne in the presence of and ?

35 / 50

35. The terminal hydrogen atom of ethyne () is acidic because the carbon atom involved is:

36 / 50

36. How are the substituents listed in the final IUPAC name if there are multiple different alkyl groups (e.g., methyl and ethyl)?

37 / 50

37. The two carbon atoms involved in the double bond of an alkene are linked by which combination of bonds?

38 / 50

38. All -directing groups are characterized by having:

39 / 50

39. Which set of reagents (R) is best suited to convert Benzaldehyde () to Benzene?

40 / 50

40. The initial, slower step in the reaction between benzene and is rate-determining. This involves the breaking of the aromaticity and has a high activation energy, characteristic of:

41 / 50

41. The intermediate compound formed immediately after the reaction of an alkene with ozone () but before the workup is called a:

42 / 50

42. The carbon atoms in an alkane chain are joined by which type of bond?

43 / 50

43. The nitration of benzene is an example of which general class of organic reaction?

44 / 50

44. Ozonolysis of an unknown alkene yields () and (). Identify the structure of the starting alkene.

45 / 50

45. According to Molecular Orbital theory, the six electrons in benzene are delocalized over how many carbon atoms?

46 / 50

46. For the aromatic compound Naphthalene (), what is the value of 'n' in Hückel's rule ( electrons)?

47 / 50

47. What is the main limitation of the Wurtz reaction when attempting to prepare an unsymmetrical alkane, such as Propane?

48 / 50

48. A hydrocarbon has the molecular formula . How many possible positional isomers are there if the parent chain is kept as a straight chain (Hexane)?

49 / 50

49. The decomposition of a higher alkane into a mixture of lower alkanes, alkenes, and hydrogen by heating it to a high temperature is called:

50 / 50

50. Terminal alkynes (e.g., Ethyne) are characterized by the presence of an acidic hydrogen atom. The acidity is primarily due to the:

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Practice Hydrocarbons MCQs
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Class 11 Chemistry — Chapter 13: Hydrocarbons Online Test

Welcome to the Class 11 Chemistry Chapter 13: Hydrocarbons Online Test—a perfect tool to practice and enhance your understanding of hydrocarbons. This chapter test features a pool of 290 MCQs designed to help you build confidence and assess your knowledge. With easy-to-follow questions on various types of hydrocarbons, this online test is a free, CBSE/NCERT-aligned resource, perfect for students preparing for their Class 11 exams and competitive entrance tests like JEE and NEET.

Are you ready to test your knowledge on alkanes, alkenes, alkynes, and aromatic hydrocarbons? This test offers a detailed chapter-wise breakdown and serves as a valuable online mock test that mimics real exam conditions. You can take this test at your own pace and get instant feedback, including a detailed review of your answers. Want to improve your understanding of hydrocarbons? Try the test now and track your progress.

What is this Class 11 Chemistry: Hydrocarbons Online Test?

This page provides three MCQ papers for Chapter 13 (Hydrocarbons):

  • Paper 1 (Easy) — Foundation: 20 questions · 30 min · Pass 40% · Fixed set
  • Paper 2 (Medium) — Mixed: 30 questions · 45 min · Pass 50% · Randomized from a pool of ~290 questions
  • Paper 3 (Hard) — Challenge: 50 questions · 75 min · Pass 70% · Randomized from the same pool + Certificate on pass

Note: Every attempt provides fresh question mixes for Paper 2 and Paper 3. You will receive instant results and answer reviews once you finish each test.

Topics covered in this online test

The test covers all key topics in Chapter 13: Hydrocarbons from the NCERT Class 11 Chemistry syllabus. You will practice questions from the following topics:

  • Introduction to Hydrocarbons — Definition, classification, and types of hydrocarbons (alkanes, alkenes, alkynes, and aromatic hydrocarbons)
  • Alkanes — Properties, nomenclature, isomerism, and preparation methods
  • Alkenes — Preparation, properties, addition reactions, Markovnikov’s rule, polymerization
  • Alkynes — Preparation, properties, reactions, and uses of alkynes
  • Aromatic Hydrocarbons — Structure of benzene, properties, electrophilic substitution reactions
  • Hydrocarbon Reactions — Combustion, halogenation, hydrogenation, addition reactions
  • Important Functional Groups — Halogenation, oxidation reactions, and their significance in organic chemistry
  • Nomenclature of Hydrocarbons — IUPAC nomenclature for alkanes, alkenes, alkynes, and aromatic compounds
  • Bonding in Hydrocarbons — Hybridization, sigma bonds, pi bonds

For additional practice, you can refer to the Class 11 Chemistry MCQ Question Bank and practice questions from other chapters like S-Block Elements and other topics. You can also explore our Class 11 Chemistry Online Test Index for a wider range of chapter-based tests.

How This Exam-Style Online Test Works

  • Pick a paper → Answer MCQs within the allotted time → Submit → Get instant feedback with score and answers.
  • Timed MCQs: Paper 1 (30 minutes), Paper 2 (45 minutes), Paper 3 (75 minutes).
  • Instant Feedback: Your results will be displayed immediately after submission, along with a detailed review.
  • Unlimited Attempts: You can retake the test as many times as you like, with fresh randomization in Paper 2 and Paper 3.
  • Certificate: If you score 70% or more in Paper 3, you will be awarded a certificate.

What You’ll See During the Test

  • MCQs: One question with four options (A, B, C, D).
  • Timer: P1: 30 min • P2: 45 min • P3: 75 min.
  • Pagination: Typically 10 questions per page. Click Next or use the question map to move through the test.
  • Result page: View your score %, number of correct/incorrect answers, and a review of the correct answers.
  • Retake Option: Click Restart Test to try again with new questions (Paper 2 & Paper 3 only).

Marking & Pass Criteria

  • Scoring: +1 for correct answers, 0 for incorrect (no negative marking).
  • Passing marks: Paper 1 — 40%, Paper 2 — 50%, Paper 3 — 70%.
  • Randomization: Paper 2 and Paper 3 shuffle questions from a large pool of 300 questions.

Who Can Take This Test?

  • CBSE Class 11 students revising Chapter 13 (Hydrocarbons).
  • JEE Main/Advanced & NEET aspirants building strong concepts and improving speed for chemistry-based questions.
  • Teachers and tutors who need chapter tests for assignments or practice sessions.
  • Self-learners and homeschoolers looking for a structured way to practice organic chemistry.
  • Students from other boards & countries who want extra practice on hydrocarbons.

Advantages of this Online Test

  • Real exam feel: Timed questions with instant scoring and answer reviews.
  • Randomized sets: Fresh question mixes in Paper 2 & Paper 3 on each attempt.
  • Unlimited attempts: Retake as many times as you want to improve accuracy and speed.
  • Completely free: Zero cost to attempt and no hidden charges.

How this test helps you study better

  • Step 1 – Concept Check: Take Paper 1 to test your basic knowledge on hydrocarbons.
  • Step 2 – Reinforce Learning: Take Paper 2 for a more challenging and randomized mix of questions.
  • Step 3 – Challenge Yourself: Attempt Paper 3 under exam-like conditions for a complete assessment.
  • Step 4 – Review: Analyze your mistakes and focus on weak areas for improvement.

Important Notes (Read Before You Start)

  • Do not refresh / close the tab during the test.
  • Best experience: Use the latest browser (Chrome/Edge) with a stable internet connection.
  • Allow cookies / local storage to ensure smooth progress saving.
  • Safety: This test is completely free with no hidden charges.

Continue your practice

Strengthen your Chemistry foundation further: visit the full Class 11 Chemistry Online Test Index or practice all chapters from the Class 11 Chemistry MCQ Collection.

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