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Some Basic Principles & Techniques – NEET Organic

Strengthen NEET organic fundamentals with MCQs on basic principles and lab techniques, detailed explanations, quick revision notes and practice tests.

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Organic Chemistry – Some Basic Principles and Techniques Revision Guide for NEET Chemistry

Organic Chemistry – Some Basic Principles and Techniques is part of NEET 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 Organic Chemistry – Some Basic Principles and Techniques, then test recall with mixed MCQs.

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

Concept Revision

Revise definitions, principles, equations, trends and core ideas from Organic Chemistry – Some Basic Principles and Techniques before attempting MCQs.

Exam-style MCQs

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Performance Practice

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

These public questions are selected from the exact Organic Chemistry – Some Basic Principles and Techniques 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.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

1. The correct IUPAC name of CH3CH2CH(CH3)CH2OH is:

  • A. 2-Methylpentan-1-ol
  • B. 3-Methylpentan-1-ol
  • C. 2-Methylbutan-1-ol
  • D. 3-Methylbutan-1-ol
Answer: D
Explanation: The longest chain containing –OH has four carbons. Numbering from the –OH end places –OH at C-1 and methyl at C-2, giving 2-methylbutan-1-ol.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

2. Which functional group has the highest priority for suffix nomenclature?

  • A. –NH2
  • B. –COOH
  • C. –CHO
  • D. –OH
Answer: B
Explanation: Carboxylic acid has higher nomenclature priority than aldehyde, alcohol and amine.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

3. The correct IUPAC name of CH3COCH2CH3 is:

  • A. Butanal
  • B. Butan-2-ol
  • C. Butan-2-one
  • D. Butan-1-one
Answer: C
Explanation: The four-carbon ketone has its carbonyl carbon at position 2, so its name is butan-2-one.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

4. Which pair represents chain isomerism?

  • A. Ethanol and dimethyl ether
  • B. Propanal and propanone
  • C. cis-But-2-ene and trans-but-2-ene
  • D. n-Butane and isobutane
Answer: D
Explanation: n-Butane and isobutane have the same molecular formula but different carbon skeletons.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

5. Which pair represents functional isomerism?

  • A. Ethanol and dimethyl ether
  • B. n-Butane and isobutane
  • C. 1-Propanol and 2-propanol
  • D. cis-But-2-ene and trans-but-2-ene
Answer: A
Explanation: Ethanol and dimethyl ether have formula C2H6O but different functional groups: alcohol and ether.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

6. Which pair represents position isomerism?

  • A. Propanal and propanone
  • B. 1-Propanol and 2-propanol
  • C. Ethanol and dimethyl ether
  • D. n-Pentane and neopentane
Answer: B
Explanation: The –OH group occupies different positions on the same carbon skeleton.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

7. Geometrical isomerism in alkenes arises because of:

  • A. Presence of a chiral carbon only
  • B. Rapid bond oscillation
  • C. Restricted rotation about the C=C bond
  • D. Free rotation about the C–C bond
Answer: C
Explanation: The π bond prevents free rotation around the carbon-carbon double bond, allowing distinct spatial arrangements.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

8. Which compound can show geometrical isomerism?

  • A. Propene
  • B. 2-Methylpropene
  • C. Ethene
  • D. But-2-ene
Answer: D
Explanation: Each carbon of the C=C bond in but-2-ene carries two different substituents, allowing cis and trans forms.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

9. Which species is an electrophile?

  • A. NO2+
  • B. OH−
  • C. CN−
  • D. NH3
Answer: A
Explanation: NO2+ is electron-deficient and accepts an electron pair, so it is an electrophile.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

10. Which species is a nucleophile?

  • A. H+
  • B. CN−
  • C. BF3
  • D. AlCl3
Answer: B
Explanation: CN− has an available electron pair and attacks electron-deficient centres.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

11. Which carbocation is the most stable?

  • A. Primary carbocation
  • B. Methyl carbocation
  • C. Tertiary carbocation
  • D. Secondary carbocation
Answer: C
Explanation: Alkyl groups stabilise positive charge through hyperconjugation and the +I effect, giving 3° > 2° > 1° > methyl.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

12. Which carbanion is generally the most stable among simple alkyl carbanions?

  • A. Primary carbanion
  • B. Secondary carbanion
  • C. Tertiary carbanion
  • D. Methyl carbanion
Answer: D
Explanation: Alkyl groups destabilise negative charge through the +I effect, so stability decreases with substitution.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

13. Which free radical is the most stable?

  • A. Tertiary radical
  • B. Secondary radical
  • C. Primary radical
  • D. Methyl radical
Answer: A
Explanation: Hyperconjugation and the +I effect of alkyl groups stabilise radicals, giving 3° > 2° > 1° > methyl.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

14. Homolytic bond cleavage produces:

  • A. Only anions
  • B. Free radicals
  • C. Carbocation and carbanion
  • D. Only cations
Answer: B
Explanation: In homolysis, each bonded atom takes one electron from the bond, generating radicals.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

15. Heterolytic cleavage of a covalent bond produces:

  • A. Only neutral molecules
  • B. A photon
  • C. Ions
  • D. Two radicals
Answer: C
Explanation: In heterolysis, one atom takes both bonding electrons, producing a cation and an anion.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

16. The inductive effect is transmitted through:

  • A. Pi bonds only
  • B. Hydrogen bonds
  • C. Ionic lattice only
  • D. Sigma bonds
Answer: D
Explanation: The inductive effect is permanent polarisation transmitted along sigma bonds.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

17. Which group shows a strong −I effect?

  • A. –NO2
  • B. –CH3
  • C. –C2H5
  • D. –O−
Answer: A
Explanation: The nitro group strongly withdraws electron density through sigma bonds.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

18. Which group shows a +I effect?

  • A. –COOH
  • B. Alkyl group
  • C. –NO2
  • D. –CN
Answer: B
Explanation: Alkyl groups release electron density through sigma bonds and show a +I effect.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

19. Resonance structures differ only in the arrangement of:

  • A. Sigma-bond framework
  • B. Number of atoms
  • C. Electrons
  • D. Atomic nuclei
Answer: C
Explanation: Canonical structures have the same atomic positions but differ in electron distribution.

NEET Chemistry · Organic Chemistry – Some Basic Principles and Techniques · Very Hard

20. Which species is resonance-stabilised?

  • A. Ethyl carbocation
  • B. Methyl carbocation
  • C. tert-Butyl carbocation only by resonance
  • D. Allyl carbocation
Answer: D
Explanation: The positive charge in an allyl carbocation is delocalised over two terminal carbon atoms.

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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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