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

2 / 30

2. 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)?

3 / 30

3. The halogenation of alkanes (e.g., chlorination in the presence of sunlight) proceeds through which general reaction mechanism?

4 / 30

4. The benzenesulfonic acid product can be readily converted into phenol () by first treating it with at high temperatures, followed by acidification. This conversion highlights the utility of the group as:

5 / 30

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

6 / 30

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

7 / 30

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

8 / 30

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

9 / 30

9. Polyvinyl Chloride (PVC) is considered a thermoplastic material, meaning it:

10 / 30

10. What is the fundamental characteristic that gives aromatic compounds their exceptional stability?

11 / 30

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

12 / 30

12. Fluorination of benzene is typically avoided in a laboratory setting because the reaction is:

13 / 30

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

14 / 30

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

15 / 30

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

16 / 30

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

17 / 30

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

18 / 30

18. What is the product formed after the first stage of chlorination of Methane () in the presence of UV light?

19 / 30

19. Which type of orbital overlap forms the bond component of an alkene's double bond?

20 / 30

20. The conversion of a higher alkane into an isomeric branched-chain alkane in the presence of an anhydrous aluminum chloride and hydrogen chloride is called:

21 / 30

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

22 / 30

22. The -electron count for the Pyridine molecule () is:

23 / 30

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

24 / 30

24. The reaction of Ethyne with hydrogen gas () in the presence of Nickel () catalyst yields which final product?

25 / 30

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

26 / 30

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

27 / 30

27. All -directing groups are characterized by having:

28 / 30

28. The primary purpose of ozonolysis ( followed by ) in alkene chemistry is to:

29 / 30

29. The mechanism by which is damaged by the reactive metabolites of PAHs is termed:

30 / 30

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

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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. Which of the following statements regarding the structure of Benzene is correct?

2 / 50

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

3 / 50

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

4 / 50

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

5 / 50

5. Which reagent is typically used for the halogenation (e.g., chlorination) of Benzene to prevent addition and favor substitution?

6 / 50

6. The reaction of an internal alkyne with in an inert solvent results in the formation of a product with which stereochemistry?

7 / 50

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

8 / 50

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

9 / 50

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

10 / 50

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

11 / 50

11. Which of the following is an essential condition for two organic compounds to be structural isomers?

12 / 50

12. The Friedel–Crafts Alkylation reaction uses an alkyl halide () and a Lewis acid catalyst to introduce an alkyl group onto a benzene ring. The primary Lewis acid catalyst used is:

13 / 50

13. If a benzene ring is substituted with both a group (strongly activating, ) and a atom (deactivating, ), where will the next electrophile predominantly substitute?

14 / 50

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

15 / 50

15. 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:

16 / 50

16. 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:

17 / 50

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

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

20 / 50

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

21 / 50

21. Which of the following -electron counts for a planar, cyclic, fully conjugated system would result in the greatest destabilization (anti-aromaticity)?

22 / 50

22. 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?

23 / 50

23. 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:

24 / 50

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

25 / 50

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

26 / 50

26. The electrophile that attacks the benzene ring during the nitration reaction is:

27 / 50

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

28 / 50

28. The two main types of Polyethylene, Low-Density Polyethylene (LDPE) and High-Density Polyethylene (HDPE), primarily differ in their:

29 / 50

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

30 / 50

30. In the decarboxylation reaction using soda lime, the role of Calcium Oxide () is primarily to:

31 / 50

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

32 / 50

32. Which of the following classes of hydrocarbons is generally called Paraffins?

33 / 50

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

34 / 50

34. Which of the following is an advantage of Friedel–Crafts Acylation over Alkylation?

35 / 50

35. 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:

36 / 50

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

37 / 50

37. The primary difference between a homopolymer (like polyethylene) and a copolymer is:

38 / 50

38. Which rule governs the major product formed during the dehydrohalogenation (removal of ) of a secondary alkyl halide?

39 / 50

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

40 / 50

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

41 / 50

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

42 / 50

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

43 / 50

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

44 / 50

44. 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)?

45 / 50

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

46 / 50

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

47 / 50

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

48 / 50

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

49 / 50

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

50 / 50

50. 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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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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