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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

How many benzene rings are present in the fused polycyclic compound phenanthrene?

  • Two
  • Three
  • Four
  • Five
0 Comments
Correct Answer: B. Three

Explanation:

Phenanthrene is a polycyclic aromatic hydrocarbon (PAH) composed of three fused benzene rings ... Read More Details

2 Organic Chemistry MCQs

How many electrons in benzene (C₆H₆) form the delocalized π-electron cloud?

  • 3
  • 4
  • 6
  • 8
0 Comments
Correct Answer: C. 6

Explanation:

Benzene (C₆H₆) is a planar cyclic hydrocarbon consisting of six carbon atoms arranged ... Read More Details

3 Organic Chemistry MCQs

When benzene is substituted by halogens, which halogen gets position 1 in naming the compound?

  • Bromine
  • Chlorine
  • Fluorine
  • Iodine
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Correct Answer: C. Fluorine

Explanation:

In organic chemistry, when more than one halogen atom is attached to a ... Read More Details

4 Organic Chemistry MCQs

Benzene was discovered by Michael Faraday during the destructive distillation of vegetable oil in the ?

  • Presence of oxygen
  • Presence of hydrogen
  • Absence of oxygen
  • Presence of excessive oxygen
0 Comments
Correct Answer: C. Absence of oxygen

Explanation:

Benzene (C₆H₆) was discovered by Michael Faraday in 1825 during his experiments on ... Read More Details

5 Organic Chemistry MCQs

How many moles of hydrogen gas (H₂) react with benzene in the presence of a platinum catalyst?

  • 2
  • 3
  • 4
  • 6
0 Comments
Correct Answer: B. 3

Explanation:

Benzene (C₆H₆) is an aromatic compound with six carbon atoms connected in a ... Read More Details

6 Organic Chemistry MCQs

What is the resonance energy of benzene?

  • 150.5 kJ/mol
  • 250.5 kJ/mol
  • 150.5 cal/mol
  • 250.5 cal/mol
0 Comments
Correct Answer: A. 150.5 kJ/mol

Explanation:

Benzene (C₆H₆) is an aromatic compound with a unique stability that cannot be ... Read More Details

7 Organic Chemistry MCQs

Which catalyst is used to prepare benzene from acetylene at 70°C?

  • Cr₂O₃ + Al₂O₃ + SiO₂
  • Raney nickel
  • Organo-nickel
  • Ni (250–300°C)
0 Comments
Correct Answer: C. Organo-nickel

Explanation:

Benzene can be synthesized from acetylene (ethyne) by a process known as trimerization, ... Read More Details

8 Organic Chemistry MCQs

Which method does not give benzene?

  • Sodium benzoate + soda lime
  • Phenol + Zn dust
  • Chlorobenzene + NaOH (360°C, 150 atm)
  • Benzene sulfonic acid + steam
0 Comments
Correct Answer: C. Chlorobenzene + NaOH (360°C, 150 atm)

Explanation:

Several chemical methods are used to prepare benzene from different organic compounds. Understanding ... Read More Details

9 Organic Chemistry MCQs

When bromine reacts with benzene in the presence of sunlight, what will happen?

  • The benzene ring will break
  • Substitution reaction will occur
  • Addition reaction will occur
  • No reaction will occur
0 Comments
Correct Answer: C. Addition reaction will occur

Explanation:

Benzene (C₆H₆) is an aromatic compound that generally undergoes electrophilic substitution reactions rather ... Read More Details

10 Organic Chemistry MCQs

During the sulfonation of benzene, concentrated H₂SO₄ generates which electrophile?

  • HSO₄⁻
  • SO₂
  • SO₃
  • H⁺
0 Comments
Correct Answer: B. SO₂

Explanation:

Sulfonation of benzene is an example of an electrophilic aromatic substitution (EAS) reaction ... Read More Details

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