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Chemistry MCQs

Prepare for competitive exams with our topic-wise Chemistry MCQs covering fundamental and advanced concepts. These multiple-choice questions include atomic structure, chemical bonding, periodic table, acids & bases, organic chemistry, thermodynamics, chemical equations, mole concept, electrochemistry, and biochemistry. Ideal for science students and job aspirants appearing in PPSC, FPSC, CSS, NTS, SPSC, BPSC, KPSC, ETEA, AJKPSC, and other testing services. A valuable resource for teachers, educators, and candidates targeting science educator posts, laboratory roles, and general science sections in public sector exams.

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1 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

2 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

3 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

4 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

5 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

6 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

7 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

8 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

9 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

10 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

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