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Organic Chemistry: Some Basic Principles and Techniques ISC Class 11 MCQ & Practice Questions

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Organic Chemistry: Some Basic Principles and Techniques Revision Guide for ISC Class 11 Chemistry

Organic Chemistry: Some Basic Principles and Techniques is part of ISC 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.

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  • 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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Top 20 Organic Chemistry: Some Basic Principles and Techniques MCQs with Answers

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ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

1. The property by which carbon forms bonds with other carbon atoms is called:

  • A. Ionisation
  • B. Hydration
  • C. Catenation
  • D. Allotropy
Answer: C
Explanation: Catenation is the self-linking property of carbon atoms.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

2. A homologous series consists of compounds having:

  • A. Identical physical properties
  • B. Same functional group and general formula
  • C. Same molecular formula only
  • D. Same empirical formula always
Answer: B
Explanation: Members share a functional group and general formula and successive members differ by CH2.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

3. Successive members of a homologous series generally differ by:

  • A. CH2
  • B. CH3
  • C. H2
  • D. CO2
Answer: A
Explanation: The homologous increment is one methylene unit, CH2.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

4. The IUPAC name of CH3CH2OH is:

  • A. Methanol
  • B. Ethanal
  • C. Ethanoic acid
  • D. Ethanol
Answer: D
Explanation: Two carbons give eth-, and the alcohol suffix gives ethanol.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

5. The IUPAC name of CH3CHO is:

  • A. Ethene
  • B. Ethanoic acid
  • C. Ethanal
  • D. Ethanol
Answer: C
Explanation: A two-carbon aldehyde is ethanal.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

6. The IUPAC name of CH3COCH3 is:

  • A. Propanoic acid
  • B. Propanone
  • C. Propanal
  • D. Propanol
Answer: B
Explanation: The three-carbon ketone is propanone.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

7. The functional group of aldehydes is:

  • A. -CHO
  • B. -COOH
  • C. -OH
  • D. -COO-
Answer: A
Explanation: Aldehydes contain the terminal formyl group -CHO.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

8. The functional group of carboxylic acids is:

  • A. -CHO
  • B. -CO-
  • C. -CN
  • D. -COOH
Answer: D
Explanation: Carboxylic acids contain the carboxyl group -COOH.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

9. Compounds with the same molecular formula but different structures are:

  • A. Homologues
  • B. Allotropes
  • C. Isomers
  • D. Isotopes
Answer: C
Explanation: Isomerism arises when the same molecular formula permits different arrangements.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

10. Chain isomerism results from different:

  • A. Oxidation states
  • B. Carbon skeletons
  • C. Functional groups only
  • D. Positions of isotopes
Answer: B
Explanation: Chain isomers differ in branching or arrangement of the carbon skeleton.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

11. Position isomerism arises when compounds differ in:

  • A. Position of functional group or multiple bond
  • B. Number of carbon atoms
  • C. Molecular formula
  • D. Functional group identity always
Answer: A
Explanation: The same group or unsaturation occupies different positions on the same skeleton.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

12. Functional isomers have:

  • A. Different molecular formula and same group
  • B. Same structure
  • C. Only different conformations
  • D. Same molecular formula but different functional groups
Answer: D
Explanation: Functional isomers differ in functional-group identity while retaining molecular formula.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

13. Metamerism is associated with different alkyl groups around:

  • A. A benzene ring only
  • B. A single hydrogen atom
  • C. A polyvalent functional group
  • D. A carbon-carbon double bond only
Answer: C
Explanation: Metamers have different carbon distributions around groups such as -O-, -NH-, or -CO-.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

14. Homolytic bond fission produces:

  • A. Ions of opposite charge
  • B. Free radicals
  • C. Carbocations only
  • D. Carbanions only
Answer: B
Explanation: Each atom retains one electron from the shared pair, producing radicals.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

15. Heterolytic bond fission produces:

  • A. Ions
  • B. Only free radicals
  • C. Neutrons
  • D. Two neutral atoms always
Answer: A
Explanation: One atom takes both bonding electrons, forming oppositely charged species.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

16. A carbocation is a carbon species carrying:

  • A. Negative charge
  • B. No charge and one unpaired electron
  • C. Two negative charges
  • D. Positive charge
Answer: D
Explanation: A carbocation has an electron-deficient positively charged carbon.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

17. A carbanion is a carbon species carrying:

  • A. No electrons
  • B. A proton only
  • C. Negative charge
  • D. Positive charge
Answer: C
Explanation: A carbanion has a negatively charged carbon bearing a lone pair.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

18. A free radical generally contains:

  • A. No valence electrons
  • B. An unpaired electron
  • C. A complete octet with negative charge
  • D. A positive proton only
Answer: B
Explanation: Radicals are characterised by one or more unpaired electrons.

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

19. The stability order of simple alkyl carbocations is generally:

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

ISC Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

20. The stability order of simple alkyl free radicals is generally:

  • A. Methyl > 1° > 2° > 3°
  • B. 1° > 2° > 3° > methyl
  • C. 2° > 3° > 1° > methyl
  • D. 3° > 2° > 1° > methyl
Answer: D
Explanation: Greater alkyl substitution stabilises radicals through hyperconjugation.

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Organic Chemistry: Some Basic Principles and Techniques Practice Tests

Organic Chemistry: Some Basic Principles and Techniques Frequently Asked Questions

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