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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 reaction of Prop-1-yne () with Tollen's reagent produces:

2 / 30

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

3 / 30

3. Which of the following statements is true regarding the hybridization in alkanes?

4 / 30

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

5 / 30

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

6 / 30

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

7 / 30

7. Anthracene () is a three-ring PAH. Compared to its isomer, Phenanthrene, Anthracene is generally considered to be:

8 / 30

8. How many total bonds and bonds are present in a molecule of Propene ()?

9 / 30

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

10 / 30

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

11 / 30

11. 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:

12 / 30

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

13 / 30

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

14 / 30

14. When naming a substituted benzene derivative, the two substituents are at the 1 and 3 positions. Which common prefix is used to denote this arrangement?

15 / 30

15. Which product is formed when Ethyne (Acetylene) is passed through a red-hot iron tube at ?

16 / 30

16. The alkyl halide used in the Wurtz reaction must be dissolved in which solvent for the reaction to proceed successfully?

17 / 30

17. 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?

18 / 30

18. What is the value used in Hückel's rule ( electrons) for the benzene molecule?

19 / 30

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

20 / 30

20. Which of the following is not a structural isomer of -Pentane ()?

21 / 30

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

22 / 30

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

23 / 30

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

24 / 30

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

25 / 30

25. The halogenation of benzene is an irreversible process under standard conditions, primarily due to:

26 / 30

26. Which of the following substituents is a strongly activating and -directing group?

27 / 30

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

28 / 30

28. Which catalyst is used to selectively stop the hydrogenation of an alkyne at the alkene stage (i.e., synthesize an alkene from an alkyne)?

29 / 30

29. Hydrocarbons are primarily composed of which two elements?

30 / 30

30. The intermediate formed by the reaction of the electrophile () and the benzene ring is known as the complex. This intermediate is stabilized by:

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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 is the main limitation of the Wurtz reaction for the preparation of alkanes?

2 / 50

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

3 / 50

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

4 / 50

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

5 / 50

5. Naphthalene (), the simplest PAH, is composed of how many fused benzene rings?

6 / 50

6. What is the molecular formula for -Hexane?

7 / 50

7. The number of chain isomers possible for the molecular formula (Pentane) is:

8 / 50

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

9 / 50

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

10 / 50

10. The complex formed between the Lewis acid () and the halogen () that generates the electrophile can be represented as:

11 / 50

11. What is the correct name for the compound ?

12 / 50

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

13 / 50

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

14 / 50

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

15 / 50

15. Which of the following is the condition for a pair of compounds to be metameric isomers?

16 / 50

16. Which of the following reaction types is classified as a -elimination reaction?

17 / 50

17. 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:

18 / 50

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

19 / 50

19. The lack of free rotation about the carbon-carbon double bond in alkenes is responsible for which type of isomerism?

20 / 50

20. Which type of isomerism is characterized by having the same molecular formula and the same carbon skeleton, but differing in the position of the functional group or substituent?

21 / 50

21. Ethene () is the simplest alkene. Which of the following is true about its structure?

22 / 50

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

23 / 50

23. A significant limitation shared by both Friedel–Crafts alkylation and acylation is that the reaction:

24 / 50

24. Which of the following human activities is LEAST likely to produce or expose individuals to significant amounts of PAHs?

25 / 50

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

26 / 50

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

27 / 50

27. How many bonds and bonds are present in the molecule Propyne ()?

28 / 50

28. Which type of addition is characteristic of the reaction of with an alkene in an inert solvent?

29 / 50

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

30 / 50

30. The process of heating higher alkanes in the absence of air and often in the presence of a catalyst to break them into smaller, lower molecular mass hydrocarbons (alkanes and alkenes) is called:

31 / 50

31. Polyethylene (PE) is formed from the monomer Ethene. What is the repeating structural unit in the Polyethylene chain?

32 / 50

32. Kolbe's electrolytic method for the preparation of alkynes involves the electrolysis of the potassium or sodium salt of which specific class of organic compounds?

33 / 50

33. Which statement accurately describes the relationship between -Hexane and 2-Methylpentane?

34 / 50

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

35 / 50

35. Which of the following substituents is categorized as a deactivating and -directing group?

36 / 50

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

37 / 50

37. When But-2-ene () undergoes ozonolysis, the single organic product obtained after reductive workup is:

38 / 50

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

39 / 50

39. What is the molecular formula for Hex-1-yne?

40 / 50

40. What is the molecular formula for Cyclopentene?

41 / 50

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

42 / 50

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

43 / 50

43. The preference of alkanes to undergo substitution reactions rather than addition reactions is due to:

44 / 50

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

45 / 50

45. Which pair of compounds represents an example of chain isomerism?

46 / 50

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

47 / 50

47. The alkene that yields only (Acetone) upon ozonolysis is:

48 / 50

48. Anthracene () is a three-ring PAH. Compared to its isomer, Phenanthrene, Anthracene is generally considered to be:

49 / 50

49. 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?

50 / 50

50. Decarboxylation is considered a useful method for:

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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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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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