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Organic Chemistry – Some Basic Principles and Techniques CBSE Class 11 MCQ & Practice Questions

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Organic Chemistry – Some Basic Principles and Techniques Revision Guide for CBSE Class 11 Chemistry

Organic Chemistry – Some Basic Principles and Techniques 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

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What to practise in Organic Chemistry – Some Basic Principles and Techniques

Concept Revision

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Exam-style MCQs

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Top 8 Organic Chemistry – Some Basic Principles and Techniques MCQs with Answers

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CBSE Class 11 Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

1. The correct order of stability of carbocations is:

  • A. CH₃⁺ > 1° > 2° > 3°
  • B. 3° > 2° > 1° > CH₃⁺
  • C. 1° > 2° > 3° > CH₃⁺
  • D. 2° > 3° > 1° > CH₃⁺
Answer: B
Explanation: Hyperconjugation and +I effect stabilise more substituted carbocations.

CBSE Class 11 Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

2. A mixture of aniline (b.p. 184°C) and nitrobenzene (b.p. 211°C) is best separated by:

  • A. Simple distillation
  • B. Fractional distillation
  • C. Sublimation
  • D. Filtration
Answer: B
Explanation: For liquids with relatively close boiling points, fractional distillation is used.

CBSE Class 11 Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

3. The number of chain isomers of C₅H₁₂ is:

  • A. 2
  • B. 3
  • C. 4
  • D. 5
Answer: B
Explanation: n-Pentane, 2-methylbutane and 2,2-dimethylpropane are three chain isomers.

CBSE Class 11 Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Medium

4. Homolytic bond fission produces:

  • A. Cations only
  • B. Anions only
  • C. Free radicals
  • D. Carbenes only
Answer: C
Explanation: Each bonded atom takes one electron, forming radicals.

CBSE Class 11 Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Medium

5. A technique used to separate liquids with close boiling points is:

  • A. Filtration
  • B. Fractional distillation
  • C. Sublimation
  • D. Chromatography only
Answer: B
Explanation: Fractionating columns enable repeated vapourisation-condensation cycles.

CBSE Class 11 Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Medium

6. The IUPAC name of CH₃CH₂OH is:

  • A. Methanol
  • B. Ethanol
  • C. Propan-1-ol
  • D. Ethanal
Answer: B
Explanation: The compound has two carbon atoms and an –OH group.

CBSE Class 11 Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Medium

7. The electron-releasing effect transmitted through sigma bonds is called:

  • A. Inductive effect
  • B. Resonance effect
  • C. Electromeric effect
  • D. Hyperconjugation
Answer: A
Explanation: The inductive effect is transmitted through sigma bonds.

CBSE Class 11 Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Medium

8. The most stable carbocation is generally:

  • A. CH₃⁺
  • B. Primary
  • C. Secondary
  • D. Tertiary
Answer: D
Explanation: Alkyl groups stabilize carbocations by inductive effect and hyperconjugation.

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Organic Chemistry – Some Basic Principles and Techniques Practice Tests

Organic Chemistry – Some Basic Principles and Techniques Frequently Asked Questions

How should I prepare Organic Chemistry – Some Basic Principles and Techniques 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 Organic Chemistry – Some Basic Principles and Techniques 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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