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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 Physical Chemistry MCQs

By which method was the molecular mass of benzene determined as 78.108?

  • Specific gravity method
  • Vapour density method
  • X-ray diffraction method
  • Distillation method
0 Comments
Correct Answer: B. Vapour density method

Explanation:

The molecular mass of benzene (C₆H₆), determined as 78.108 g/mol, was obtained using ... Read More Details

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