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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

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

2 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

3 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

4 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

5 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

6 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

7 Organic Chemistry MCQs

The preparation of benzene from acetylene (C₂H₂) can also be described as ?

  • Oxidation
  • Polymerization
  • Dehydration
  • Condensation
0 Comments
Correct Answer: B. Polymerization

Explanation:

The preparation of benzene from acetylene (C₂H₂) is an important reaction in organic ... Read More Details

8 Organic Chemistry MCQs

What is produced when benzene undergoes ozonolysis?

  • Glycol
  • Glyoxal
  • Vicinal diol
  • Both B and C
0 Comments
Correct Answer: B. Glyoxal

Explanation:

Ozonolysis is an oxidation reaction in which an organic compound containing double or ... Read More Details

9 Organic Chemistry MCQs

Silicon differs from silica by a group of ?

  • CH₃
  • OH
  • OCH₃
  • O₂
0 Comments
Correct Answer: B. OH

Explanation:

Silicon (Si) and silica (SiO₂) are chemically related but structurally distinct substances. The ... Read More Details

10 Organic Chemistry MCQs

Acetic anhydride can be prepared by treating ethyl alcohol with __________?

  • P₂O₅
  • H₂SO₄
  • Both A and B
  • PCl₅
0 Comments
Correct Answer: C. Both A and B

Explanation:

Acetic anhydride ((CH₃CO)₂O) is an important reagent in organic synthesis, widely used for ... Read More Details

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