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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

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

2 Organic Chemistry MCQs

Nitration of chlorobenzene gives which of the following products?

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

Explanation:

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

3 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

4 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

5 Organic Chemistry MCQs

A mixture of catalysts Cr₂O₃ + Al₂O₃ + SiO₂ at 500°C is used when benzene is prepared from which compound?

  • Acetylene
  • n-Hexane
  • Benzene sulphonic acid
  • Sodium benzoate
0 Comments
Correct Answer: B. n-Hexane

Explanation:

Benzene can be prepared from n-hexane (C₆H₁₄) through a process known as catalytic ... Read More Details

6 Organic Chemistry MCQs

Which of the following is a fused cyclic aromatic compound?

  • Diphenylamine
  • Diphenylmethane
  • Naphthalene
  • Biphenyl
0 Comments
Correct Answer: C. Naphthalene

Explanation:

A fused cyclic aromatic compound is an aromatic hydrocarbon in which two or ... Read More Details

7 Organic Chemistry MCQs

What type of compound is acetophenone?

  • Ether
  • Ketone
  • Aldehyde
  • Ester
0 Comments
Correct Answer: B. Ketone

Explanation:

Acetophenone is an important aromatic organic compound with the molecular formula C₆H₅COCH₃. It ... Read More Details

8 Organic Chemistry MCQs

Benzene does not undergo ?

  • Substitution reaction
  • Addition reaction
  • Polymerization reaction
  • Oxidation reaction
0 Comments
Correct Answer: B. Addition reaction

Explanation:

Benzene (C₆H₆) is an aromatic hydrocarbon that exhibits remarkable chemical stability due to ... Read More Details

9 Organic Chemistry MCQs

What is the formula of the nitronium ion?

  • NO₃
  • NO
  • NO₂⁻
  • NO₂⁺
0 Comments
Correct Answer: D. NO₂⁺

Explanation:

The nitronium ion (NO₂⁺) is one of the most important electrophiles in organic ... Read More Details

10 Organic Chemistry MCQs

When benzene is heated in air with V₂O₅ at 450°C, it undergoes ?

  • Substitution reaction
  • Addition reaction
  • Elimination reaction
  • Oxidation reaction
0 Comments
Correct Answer: D. Oxidation reaction

Explanation:

When benzene is heated in the presence of air and vanadium pentoxide (V₂O₅) ... Read More Details

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