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

Good luck! 👍

1 / 30

1. What is the sum of the stoichiometric coefficients of and in the balanced equation for the complete combustion of Propane ()?

2 / 30

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

3 / 30

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

4 / 30

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

5 / 30

5. When is added to an alkene in the presence of an organic peroxide (like benzoyl peroxide), the reaction is said to follow:

6 / 30

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

7 / 30

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

8 / 30

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

9 / 30

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

10 / 30

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

11 / 30

11. Which type of hybridization is observed for all carbon atoms in the simplest member of the Alkyne family, Ethyne ()?

12 / 30

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

13 / 30

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

14 / 30

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

15 / 30

15. Which intermediate species is generated at the anode during the Kolbe's electrolytic synthesis of alkanes?

16 / 30

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

17 / 30

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

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. What is the general molecular formula for acyclic alkenes containing one carbon-carbon double bond?

20 / 30

20. A compound is classified as non-aromatic if:

21 / 30

21. Which of the following intermediates is formed at the anode during the Kolbe's electrolytic synthesis of alkynes?

22 / 30

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

23 / 30

23. What is the correct name for the compound ?

24 / 30

24. How many bonds and bonds are present in the benzene molecule ()?

25 / 30

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

26 / 30

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

27 / 30

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

28 / 30

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

29 / 30

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

30 / 30

30. 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:

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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 fundamental characteristic that gives aromatic compounds their exceptional stability?

2 / 50

2. What is the necessary condition or reagent (Z) to carry out the following transformation from Chlorobenzene to Benzene?

3 / 50

3. The difference between any two consecutive members in the Alkane homologous series is a unit of:

4 / 50

4. The addition of to Propene () follows which of the following rules for predicting the major product?

5 / 50

5. What is the approximate range of the degree of polymerization (number of monomer units, ) in commercial polyethylene?

6 / 50

6. What is the general molecular formula for acyclic alkenes containing one carbon-carbon double bond?

7 / 50

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

8 / 50

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

9 / 50

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

10 / 50

10. 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?

11 / 50

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

12 / 50

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

13 / 50

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

14 / 50

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

15 / 50

15. The bond angle around the carbon atoms of the double bond in an alkene is approximately:

16 / 50

16. The cyclopentadienyl anion (a five-membered ring with one negative charge) is aromatic because it is cyclic, planar, fully conjugated, and contains:

17 / 50

17. The dehydrohalogenation of a terminal geminal dihalide (1,1-dihalide) primarily yields which type of alkyne?"

18 / 50

18. The Kekulé structure of benzene proposed that the molecule has:

19 / 50

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

20 / 50

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

21 / 50

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

22 / 50

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

23 / 50

23. How many hydrogen atoms are present in a straight-chain alkane molecule that contains 8 carbon atoms?

24 / 50

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

25 / 50

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

26 / 50

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

27 / 50

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

28 / 50

28. As the degree of branching increases in isomeric alkanes, how does the boiling point generally change?

29 / 50

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

30 / 50

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

31 / 50

31. Identify the total number of primary carbon atoms in the structure of 2,2-Dimethylpropane (Neopentane).

32 / 50

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

33 / 50

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

34 / 50

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

35 / 50

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

36 / 50

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

37 / 50

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

38 / 50

38. The formation of Polyethylene from Ethene is an example of which type of polymerization reaction?

39 / 50

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

40 / 50

40. The bromination of benzene is generally preferred over the chlorination in many laboratory syntheses because:

41 / 50

41. What is the approximate length of the carbon-carbon bonds in the stable benzene ring?

42 / 50

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

43 / 50

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

44 / 50

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

45 / 50

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

46 / 50

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

47 / 50

47. The compound Cyclooctatetraene () has electrons. Why is it considered non-aromatic rather than anti-aromatic?

48 / 50

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

49 / 50

49. What is the correct IUPAC name for the aromatic compound with two nitro groups attached to the benzene ring at positions 1 and 4?

50 / 50

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

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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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