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Organic Chemistry MCQs

Study key concepts of Organic Chemistry with our structured Organic Chemistry MCQs, tailored for students, teachers, and job seekers preparing for science and chemistry-related exams. These multiple-choice questions cover hydrocarbons, functional groups, alcohols, alkyl halides, carboxylic acids, amines, esters, aromatic compounds, reaction mechanisms, IUPAC nomenclature, stereochemistry, and organic synthesis pathways. Frequently asked in exams conducted by PPSC, FPSC, CSS, NTS, SPSC, BPSC, KPSC, ETEA, AJKPSC, and in tests for Lecturer Chemistry, Medical Colleges, and Pharmaceutical roles.

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1 Organic Chemistry MCQs

Which compound will readily undergo sulfonation?

  • Benzene
  • Nitrobenzene
  • Toluene
  • Chlorobenzene
0 Comments
Correct Answer: C. Toluene

Explanation:

Sulfonation is an electrophilic aromatic substitution (EAS) reaction in which a –SO₃H group ... Read More Details

2 Organic Chemistry MCQs

Which one of the following statements is not correct about benzene?

  • During hydrogenation, 208 kJ/mol of energy is released.
  • The C–H bond length in benzene is 1.09 Å.
  • The molecular mass of benzene is 78.108 g/mol.
  • The resonance energy of benzene is 150.5 kcal/mol.
0 Comments
Correct Answer: B. The C–H bond length in benzene is 1.09 Å.

Explanation:

Benzene (C₆H₆) is an aromatic hydrocarbon consisting of six carbon atoms arranged in ... Read More Details

3 Organic Chemistry MCQs

The replacement of a hydrogen atom in benzene with an alkyl group using an alkyl halide and AlCl₃ is called:

  • Dow’s process
  • Friedel–Crafts acylation
  • Friedel–Crafts alkylation
  • Clemmensen reduction
0 Comments
Correct Answer: C. Friedel–Crafts alkylation

Explanation:

Friedel–Crafts alkylation is an important electrophilic substitution reaction in organic chemistry. In this ... Read More Details

4 Organic Chemistry MCQs

Which compound forms benzoic acid when oxidized with acidified KMnO₄ or K₂Cr₂O₇?

  • Toluene
  • Ethylbenzene
  • n-Propylbenzene
  • All of the above
0 Comments
Correct Answer: D. All of the above

Explanation:

Oxidation of alkylbenzenes is an important reaction in organic chemistry. When an alkyl ... Read More Details

5 Organic Chemistry MCQs

What is the molecular formula of benzenetriozonide?

  • C₆H₆O₉
  • C₆H₅O₈
  • C₆H₅O₉
  • C₆H₆O₆
0 Comments
Correct Answer: A. C₆H₆O₉

Explanation:

Benzenetriozonide is an organic trioxide derivative of benzene formed when benzene reacts with ... Read More Details

6 Organic Chemistry MCQs

The hydrolysis of benzenetrizonide yields three moles of which compound?

  • Glyoxime
  • Benzaldehyde
  • Glycol
  • Glyoxal
0 Comments
Correct Answer: D. Glyoxal

Explanation:

Benzenetrizonide is a triazene derivative containing three nitrogen atoms connected to a benzene ... Read More Details

7 Organic Chemistry MCQs

In benzene sulphonic acid, the sulphonic group is attached to the benzene ring through which atom?

  • Hydrogen
  • Oxygen
  • Sulphur
  • OH
0 Comments
Correct Answer: C. Sulphur

Explanation:

Benzene sulphonic acid (C₆H₅SO₃H) is an important aromatic compound formed when benzene undergoes ... Read More Details

8 Organic Chemistry MCQs

Aniline is a derivative of benzene which contains which functional group?

  • Imino group
  • Amino group
  • Amide group
  • Nitro group
0 Comments
Correct Answer: B. Amino group

Explanation:

Aniline (C₆H₅NH₂) is one of the simplest and most important aromatic amines in ... Read More Details

9 Organic Chemistry MCQs

Nitration of chlorobenzene gives which of the following products?

  • o-Chloronitrobenzene
  • p-Chloronitrobenzene
  • m-Chloronitrobenzene
  • A & B
0 Comments
Correct Answer: D. A & B

Explanation:

When chlorobenzene (C₆H₅Cl) undergoes nitration, it reacts with a mixture of concentrated nitric ... Read More Details

10 Organic Chemistry MCQs

Chlorination of toluene in the presence of sunlight produces which compound?

  • Benzyl chloride
  • o-Chlorotoluene
  • p-Chlorotoluene
  • Benzoic acid
0 Comments
Correct Answer: A. Benzyl chloride

Explanation:

When toluene (C₆H₅CH₃) is treated with chlorine (Cl₂) in the presence of sunlight ... Read More Details

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