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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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