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Hydrocarbons CBSE Class 11 MCQ & Practice Questions

Practice Hydrocarbons MCQs for CBSE Class 11 Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

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Hydrocarbons Revision Guide for CBSE Class 11 Chemistry

Hydrocarbons is part of CBSE Class 11 Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

Use the sample MCQs on this page to check understanding, then attempt the related ChemNexa tests for broader practice. When an answer is wrong, review the explanation and return to the underlying concept before attempting another set.

Important Topics

  • Core definitions and principles
  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
  • Exam-style multiple-choice questions
  • Error review and targeted revision

Revision Tip

Create a one-page summary of trends, structures, reactions, exceptions and key terminology for Hydrocarbons, then test recall with mixed MCQs.

What to practise in Hydrocarbons

Concept Revision

Revise definitions, principles, equations, trends and core ideas from Hydrocarbons before attempting MCQs.

Exam-style MCQs

Use chapter-focused multiple-choice practice to improve accuracy, recall and application for CBSE Class 11 Chemistry.

Performance Practice

Attempt ChemNexa tests, review results and return to weak areas for another round of targeted revision.

Top 20 Hydrocarbons MCQs with Answers

These public questions are selected from the exact Hydrocarbons chapter, screened for topic relevance and deduplicated so repeated versions of the same MCQ are not shown publicly. Use them for quick revision, then sign in to attempt the complete test experience with more questions, results and performance review.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

1. General formula of alkanes:

  • A. CnH2n
  • B. CnH2n+2
  • C. CnH2n-2
  • D. CnHn
Answer: B
Explanation: Alkanes are saturated hydrocarbons.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

2. General formula of alkenes:

  • A. CnH2n
  • B. CnH2n+2
  • C. CnH2n-2
  • D. CnHn
Answer: A
Explanation: Alkenes contain one double bond.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

3. General formula of alkynes:

  • A. CnH2n
  • B. CnH2n+2
  • C. CnH2n-2
  • D. CnHn
Answer: C
Explanation: Alkynes contain one triple bond.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

4. Hybridisation of carbon in methane:

  • A. sp
  • B. sp2
  • C. sp3
  • D. dsp2
Answer: C
Explanation: Methane is tetrahedral.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

5. Hybridisation of carbon in ethene:

  • A. sp
  • B. sp2
  • C. sp3
  • D. sp3d
Answer: B
Explanation: Each carbon is sp² hybridised.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

6. Hybridisation of carbon in ethyne:

  • A. sp
  • B. sp2
  • C. sp3
  • D. dsp3
Answer: A
Explanation: Each carbon is sp hybridised.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

7. Bromine water is decolourised by:

  • A. Ethane
  • B. Ethene
  • C. Methane
  • D. Cyclohexane
Answer: B
Explanation: Addition occurs across C=C.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

8. Markovnikov's rule applies to:

  • A. Hydrogenation
  • B. Electrophilic addition
  • C. Combustion
  • D. Substitution
Answer: B
Explanation: Addition of HX to unsymmetrical alkenes.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

9. Anti-Markovnikov addition occurs in presence of:

  • A. FeCl3
  • B. Peroxide
  • C. Ni
  • D. Pt
Answer: B
Explanation: Peroxide effect with HBr.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

10. Main reaction of alkanes:

  • A. Addition
  • B. Substitution
  • C. Polymerisation
  • D. Hydration
Answer: B
Explanation: Free radical substitution.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

11. Catalytic hydrogenation converts:

  • A. Alkane to alkene
  • B. Alkene to alkane
  • C. Alcohol to alkane
  • D. Alkyne to alcohol
Answer: B
Explanation: H2/Ni adds across double bond.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

12. Benzene undergoes mainly:

  • A. Addition
  • B. Substitution
  • C. Combustion only
  • D. Polymerisation
Answer: B
Explanation: Aromatic substitution preserves aromaticity.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

13. Empirical formula of benzene:

  • A. CH
  • B. CH2
  • C. C6H6
  • D. C3H3
Answer: A
Explanation: Simplest ratio is CH.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

14. Number of π electrons in benzene:

  • A. 4
  • B. 6
  • C. 8
  • D. 10
Answer: B
Explanation: Hückel aromatic sextet.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

15. Toluene is:

  • A. Methylbenzene
  • B. Ethylbenzene
  • C. Cyclohexane
  • D. Phenol
Answer: A
Explanation: Common name methylbenzene.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

16. Acetylene is:

  • A. Ethane
  • B. Ethene
  • C. Ethyne
  • D. Methane
Answer: C
Explanation: Acetylene is ethyne.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

17. Natural gas mainly contains:

  • A. Ethene
  • B. Methane
  • C. Propane
  • D. Butane
Answer: B
Explanation: Methane is major component.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

18. LPG mainly contains:

  • A. Methane only
  • B. Propane and butane
  • C. Ethyne
  • D. Hydrogen
Answer: B
Explanation: Commercial LPG.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

19. CNG mainly contains:

  • A. Methane
  • B. Ethane
  • C. Propene
  • D. Benzene
Answer: A
Explanation: Compressed natural gas.

CBSE Class 11 Chemistry · Hydrocarbons · Very Very Hard

20. Highest C-C bond order in:

  • A. Ethane
  • B. Ethene
  • C. Ethyne
  • D. Benzene
Answer: C
Explanation: Triple bond has bond order 3.

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Hydrocarbons Practice Tests

Hydrocarbons Frequently Asked Questions

How should I prepare Hydrocarbons for CBSE Class 11 Chemistry?

Revise the core concepts first, make a short list of important relationships or exceptions, and then solve chapter-focused MCQs while reviewing every error.

How can ChemNexa help with Hydrocarbons practice?

This page provides public sample questions and links to published ChemNexa tests so you can combine quick revision with structured practice.

What should I do after getting an MCQ wrong?

Identify whether the mistake came from a concept gap, calculation, unit, sign, wording or memory error, review that point, and then attempt a similar question again.

Continue with another chapter to build connected concepts and strengthen your overall Chemistry preparation.

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