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Substitution & Elimination – NEET Organic Reactions

Master NEET organic reactions with substitution and elimination MCQs, stepwise explanations, concept summaries and linked ChemNexa practice tests.

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Organic Substitution and Elimination Revision Guide for NEET Chemistry

Organic Substitution and Elimination 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

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What to practise in Organic Substitution and Elimination

Concept Revision

Revise definitions, principles, equations, trends and core ideas from Organic Substitution and Elimination before attempting MCQs.

Exam-style MCQs

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Performance Practice

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Top 20 Organic Substitution and Elimination MCQs with Answers

These public questions are selected from the exact Organic Substitution and Elimination 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 Substitution and Elimination · Very Very Hard

1. Which principle is essential when solving a quantitative problem in Organic Substitution and Elimination?

  • A. Assuming all coefficients are unity
  • B. Ignoring limiting conditions
  • C. Conservation of mass and charge where applicable
  • D. Ignoring units
Answer: C
Explanation: Mass and charge conservation are fundamental.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

2. At equilibrium in a reversible system related to Organic Substitution and Elimination, which statement is correct?

  • A. The catalyst is consumed
  • B. Forward and reverse rates are equal
  • C. All molecular motion stops
  • D. Reactant and product concentrations must be equal
Answer: B
Explanation: Dynamic equilibrium has equal forward and reverse rates.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

3. For a spontaneous process at constant T and P in a Organic Substitution and Elimination context, ΔG is:

  • A. Negative
  • B. Positive
  • C. Always zero
  • D. Always equal to ΔH
Answer: A
Explanation: Spontaneity at constant T,P requires ΔG<0.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

4. Which statement about a catalyst in Organic Substitution and Elimination is correct?

  • A. It changes ΔG°
  • B. It changes reaction enthalpy
  • C. It is always consumed
  • D. It lowers the activation barrier without changing K at fixed T
Answer: D
Explanation: Catalysts affect kinetics, not equilibrium thermodynamics.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

5. Oxidation in a redox step relevant to Organic Substitution and Elimination means:

  • A. No oxidation-number change
  • B. Only gain of hydrogen
  • C. Loss of electrons
  • D. Gain of electrons
Answer: C
Explanation: Oxidation is electron loss.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

6. Reduction in a redox step relevant to Organic Substitution and Elimination means:

  • A. Only loss of hydrogen
  • B. Gain of electrons
  • C. Loss of electrons
  • D. Increase in oxidation number
Answer: B
Explanation: Reduction is electron gain.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

7. A Lewis acid encountered in Organic Substitution and Elimination is an:

  • A. Electron-pair acceptor
  • B. Electron-pair donor
  • C. Proton acceptor only
  • D. Anion only
Answer: A
Explanation: Lewis acids accept electron pairs.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

8. A Lewis base encountered in Organic Substitution and Elimination is an:

  • A. Electron-pair acceptor
  • B. Cation only
  • C. Oxidising agent only
  • D. Electron-pair donor
Answer: D
Explanation: Lewis bases donate electron pairs.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

9. Which is a state function useful in Organic Substitution and Elimination?

  • A. Work
  • B. Path length
  • C. Enthalpy
  • D. Heat
Answer: C
Explanation: Enthalpy is path independent.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

10. The relation between standard Gibbs energy and equilibrium constant is:

  • A. ΔG°=RT/K
  • B. ΔG°=-RT lnK
  • C. ΔG°=RT lnK
  • D. ΔG°=-KRT
Answer: B
Explanation: The standard thermodynamic relation is ΔG°=-RT lnK.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

11. For a first-order kinetic process in Organic Substitution and Elimination, half-life equals:

  • A. 0.693/k
  • B. k/0.693
  • C. 1/(k[A]0)
  • D. [A]0/(2k)
Answer: A
Explanation: First-order t1/2=0.693/k.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

12. The Arrhenius equation is:

  • A. k=Ae^(Ea/RT)
  • B. k=EaRT
  • C. k=A/RT
  • D. k=Ae^(-Ea/RT)
Answer: D
Explanation: Arrhenius equation relates k to activation energy and temperature.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

13. For an ideal dilute solution relevant to Organic Substitution and Elimination, molarity is:

  • A. Grams solute per mole solvent
  • B. Moles solvent per litre
  • C. Moles solute per litre solution
  • D. Moles solute per kg solvent
Answer: C
Explanation: M=n/V(L).

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

14. For a weak acid, a larger Ka generally indicates:

  • A. A stronger conjugate acid
  • B. A stronger acid
  • C. A weaker acid
  • D. No ionisation
Answer: B
Explanation: Larger Ka means greater ionisation.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

15. At 25°C, pH+pOH for aqueous solution is:

  • A. 14
  • B. 7
  • C. 1
  • D. 0
Answer: A
Explanation: pH+pOH=pKw=14 at 25°C.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

16. For an electrochemical cell, oxidation occurs at:

  • A. Cathode
  • B. Salt bridge
  • C. Electrolyte only
  • D. Anode
Answer: D
Explanation: Oxidation occurs at the anode.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

17. For an electrochemical cell, reduction occurs at:

  • A. Salt bridge
  • B. Wire
  • C. Cathode
  • D. Anode
Answer: C
Explanation: Reduction occurs at the cathode.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

18. A positive E°cell implies:

  • A. No spontaneous reaction
  • B. ΔG°<0
  • C. ΔG°>0
  • D. K<1 necessarily
Answer: B
Explanation: ΔG°=-nFE°.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

19. Higher bond order generally corresponds to:

  • A. Shorter stronger bond
  • B. Longer weaker bond
  • C. Longer stronger bond
  • D. No bond-length effect
Answer: A
Explanation: Higher bond order strengthens and shortens bonds.

NEET Chemistry · Organic Substitution and Elimination · Very Very Hard

20. A nucleophile in an organic reaction related to Organic Substitution and Elimination is:

  • A. Electron-pair acceptor
  • B. Always positively charged
  • C. Always a radical
  • D. Electron-pair donor
Answer: D
Explanation: Nucleophiles donate electron pairs.

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Organic Substitution and Elimination Practice Tests

Organic Substitution and Elimination Frequently Asked Questions

How should I prepare Organic Substitution and Elimination for NEET Chemistry?

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