Exam-Style Online Test | Class 11 Chemistry: Hydrocarbons

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. When Prop-1-yne is hydrated (), the final product is (Acetone). This is because the initial addition follows Markownikov's rule, placing the group on:

2 / 30

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

3 / 30

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

4 / 30

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

5 / 30

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

6 / 30

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

7 / 30

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

8 / 30

8. When 1-Butene reacts with in the absence of peroxides, the major product is 2-Bromobutane. This is an example of an addition reaction that follows:

9 / 30

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

10 / 30

10. The carbon atoms at the ends of a straight-chain alkane are termed as:

11 / 30

11. Which of the following constitutional (structural) isomers of has a four-carbon parent chain?

12 / 30

12. Which of the following compounds would require a high temperature and high pressure for substitution with an aqueous base ()?

13 / 30

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

14 / 30

14. If Toluene is sulfonated at a low temperature (e.g., ), the major product is primarily the isomer. If the temperature is raised to , the major product shifts to the isomer. This phenomenon is an example of:

15 / 30

15. But-1-yne and Buta-1,3-diene are examples of which type of isomerism?

16 / 30

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

17 / 30

17. What is the main limitation of the Wurtz reaction for the preparation of alkanes?

18 / 30

18. According to Hückel's rule, for a compound to be considered aromatic, the number of electrons in the fully conjugated cyclic system must satisfy which formula?

19 / 30

19. The carbon-carbon triple bond length in Ethyne () compared to the double bond length in Ethene () and the single bond length in Ethane () is:

20 / 30

20. Which of the following PAHs is considered one of the most potent carcinogens and is found in high concentrations in cigarette smoke and coal tar?

21 / 30

21. If the temperature is too high during the nitration of benzene, the formation of which product is favored?

22 / 30

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

23 / 30

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

24 / 30

24. What is the correct IUPAC name for the compound ?

25 / 30

25. Which of the following alkanes can be prepared in good yield by the Wurtz reaction using only a single type of alkyl halide?

26 / 30

26. Which of the following is an example of an addition polymerization reaction involving an alkene?

27 / 30

27. How many possible structural isomers exist for Dimethylbenzene (Xylene)?

28 / 30

28. The reaction of an alkene with hydrogen gas () in the presence of a metal catalyst (, , or ) is known as:

29 / 30

29. What is the common name of the alkane with four carbon atoms that exhibits chain isomerism with -Butane?

30 / 30

30. A compound with the molecular formula can represent either a simple alkyne or:

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

2 / 50

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

3 / 50

3. The decolorization of an aqueous solution of cold, dilute, alkaline potassium permanganate ( reagent) is a characteristic test for the presence of:

4 / 50

4. What is the approximate bond angle in a simple, unsubstituted alkane like Methane ()?

5 / 50

5. The carbon-carbon triple bond length in Ethyne () compared to the double bond length in Ethene () and the single bond length in Ethane () is:

6 / 50

6. What distinguishes a cis-isomer from a trans-isomer in a disubstituted alkene?

7 / 50

7. Which of the following numbers of electrons is consistent with Hückel's rule for an aromatic compound?

8 / 50

8. What is the correct IUPAC name for the terminal alkyne structure ?

9 / 50

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

10 / 50

10. Which of the following species is an example of an anti-aromatic compound?

11 / 50

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

12 / 50

12. The hydrogenation of -Xylene () using and under mild conditions results in what major product (L)?

13 / 50

13. The halogenation of alkanes (e.g., Chlorination of Methane) is an example of which type of organic reaction mechanism?

14 / 50

14. The structure of Benzene is best represented by a resonance hybrid of the two structures proposed by:

15 / 50

15. The carbon atoms at the ends of a straight-chain alkane are termed as:

16 / 50

16. How many total bonds and bonds are present in a molecule of But-2-yne ()?

17 / 50

17. The -electron count in the smallest aromatic PAH, Naphthalene, is:

18 / 50

18. What is the geometry and bond angle around the carbon atoms of the triple bond in a simple alkyne?

19 / 50

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

20 / 50

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

21 / 50

21. The hybridization of all six carbon atoms in the benzene ring is:

22 / 50

22. Which of the following is the monomer used to produce Polyvinyl Chloride (PVC)?

23 / 50

23. In the Molecular Orbital (MO) model of Benzene, the six -orbitals on the carbon atoms combine to form how many bonding molecular orbitals?

24 / 50

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

25 / 50

25. How many possible structural isomers exist for Dimethylbenzene (Xylene)?

26 / 50

26. The addition of to Ethene is a test for unsaturation. The mechanism for this reaction is an example of:

27 / 50

27. The reaction of Toluene with an excess of Bromine () in the presence of yields the major organic product (Y). What is (Y)?

28 / 50

28. The electrophile that attacks the benzene ring during the sulfonation reaction is the:

29 / 50

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

30 / 50

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

31 / 50

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

32 / 50

32. A crucial difference in the required starting materials for Alkylation versus Acylation is that Acylation uses an acyl halide () or an acid anhydride, while Alkylation uses:

33 / 50

33. What is the essential purpose of using concentrated sulfuric acid () along with concentrated nitric acid () in the nitration of benzene?

34 / 50

34. 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)?

35 / 50

35. Which of the following reagents will react with But-1-yne but not with But-2-yne?

36 / 50

36. An alkene yields one mole of and one mole of (Methyl Ethyl Ketone) upon ozonolysis. What was the starting alkene?

37 / 50

37. What is the main limitation of the Wurtz reaction for the preparation of alkanes?

38 / 50

38. What is the molecular formula for -Hexane?

39 / 50

39. What is the approximate bond length in a typical alkene, such as Ethene ()?

40 / 50

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

41 / 50

41. What is the general molecular formula for an acyclic alkyne containing one carbon-carbon triple bond?

42 / 50

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

43 / 50

43. If 1-Propanol () is dehydrated with concentrated at , what is the product?

44 / 50

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

45 / 50

45. 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?

46 / 50

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

47 / 50

47. The electrolysis of an aqueous solution of sodium ethanoate () using the Kolbe's method produces which main product at the anode?

48 / 50

48. Ozonolysis of 2-Butene () followed by treatment with yields which product?

49 / 50

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

50 / 50

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

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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.

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