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

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

Organic Chemistry: Some Basic Principles and Techniques is part of WBCHSE 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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WBCHSE Class 11 Chemistry · Organic Chemistry: Some Basic Principles and Techniques · Very Hard

1. The property of carbon chiefly responsible for formation of long chains is:

  • A. Electrovalency
  • B. Radioactivity
  • C. Catenation
  • D. Allotropy only
Answer: C
Explanation: Strong C-C bonds allow carbon atoms to link into chains and rings.

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

2. A carbon atom forming four single covalent bonds is generally:

  • A. dsp2 hybridised
  • B. sp3 hybridised
  • C. sp2 hybridised
  • D. sp hybridised
Answer: B
Explanation: Four sigma-bonding domains correspond to sp3 hybridisation.

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

3. Carbon in a typical C=C double bond is:

  • A. sp2 hybridised
  • B. sp3 hybridised
  • C. sp hybridised
  • D. d2sp3 hybridised
Answer: A
Explanation: A double-bonded carbon normally has three sigma domains and one unhybridised p orbital.

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

4. Carbon in a typical C≡C triple bond is:

  • A. sp2 hybridised
  • B. sp3 hybridised
  • C. dsp3 hybridised
  • D. sp hybridised
Answer: D
Explanation: Triple-bonded carbon uses sp orbitals for sigma bonds and two p orbitals for pi bonds.

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

5. A C=C double bond contains:

  • A. Two pi bonds
  • B. One sigma only
  • C. One sigma and one pi bond
  • D. Two sigma bonds
Answer: C
Explanation: A double bond consists of one sigma and one pi bond.

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

6. A C≡C triple bond contains:

  • A. Three pi bonds
  • B. One sigma and two pi bonds
  • C. Three sigma bonds
  • D. Two sigma and one pi bond
Answer: B
Explanation: A triple bond consists of one sigma and two pi bonds.

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

7. Homolytic bond cleavage produces:

  • A. Free radicals
  • B. Only cations
  • C. Only anions
  • D. Carbenes necessarily
Answer: A
Explanation: In homolysis each atom takes one electron from the bonding pair.

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

8. Heterolytic bond cleavage produces:

  • A. Only radicals
  • B. Only neutral atoms
  • C. No reactive intermediates
  • D. Ions
Answer: D
Explanation: In heterolysis one atom takes both bonding electrons, generating ions.

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

9. A species containing a positively charged carbon is a:

  • A. Free radical
  • B. Electrophile-free molecule
  • C. Carbocation
  • D. Carbanion
Answer: C
Explanation: Carbocations contain electron-deficient positively charged carbon.

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

10. A species containing a negatively charged carbon is a:

  • A. Arenium ion only
  • B. Carbanion
  • C. Carbocation
  • D. Free radical
Answer: B
Explanation: Carbanions contain carbon bearing a negative charge and lone pair.

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

11. A carbon free radical commonly contains:

  • A. An unpaired electron
  • B. A complete negative charge necessarily
  • C. A complete positive charge necessarily
  • D. No valence electrons
Answer: A
Explanation: Free radicals are characterised by an unpaired electron.

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

12. An electrophile is a species that:

  • A. Donates an electron pair
  • B. Always carries negative charge
  • C. Always contains oxygen
  • D. Accepts an electron pair
Answer: D
Explanation: Electrophiles are electron-pair acceptors.

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

13. A nucleophile is a species that:

  • A. Always has positive charge
  • B. Cannot contain lone pairs
  • C. Donates an electron pair
  • D. Accepts an electron pair
Answer: C
Explanation: Nucleophiles donate electron density to electron-deficient centres.

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

14. Which is a typical electrophile?

  • A. NH3
  • B. H+
  • C. OH-
  • D. CN-
Answer: B
Explanation: H+ is electron deficient and accepts an electron pair.

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

15. Which is a typical nucleophile?

  • A. OH-
  • B. H+
  • C. BF3
  • D. AlCl3
Answer: A
Explanation: OH- has available lone-pair electron density.

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

16. The inductive effect is transmitted mainly through:

  • A. Pi bonds only
  • B. Hydrogen bonds
  • C. Ionic lattices
  • D. Sigma bonds
Answer: D
Explanation: Inductive polarisation is relayed through sigma bonds.

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

17. The inductive effect generally:

  • A. Is independent of distance
  • B. Exists only in aromatic compounds
  • C. Decreases with distance
  • D. Increases indefinitely with distance
Answer: C
Explanation: Sigma-bond polarisation rapidly diminishes along the chain.

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

18. An electron-withdrawing substituent exhibits:

  • A. Only hyperconjugation
  • B. -I effect
  • C. +I effect only
  • D. No inductive effect
Answer: B
Explanation: Electron-withdrawing groups pull sigma electron density and show -I effect.

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

19. Alkyl groups generally show:

  • A. +I effect
  • B. -I effect
  • C. Strong -M effect only
  • D. No electronic effect
Answer: A
Explanation: Alkyl groups donate electron density inductively.

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

20. Resonance involves delocalisation of:

  • A. Atomic nuclei only
  • B. Neutrons
  • C. Entire molecules between vessels
  • D. Electrons without movement of atomic nuclei
Answer: D
Explanation: Canonical structures differ only in electron arrangement.

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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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