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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

The octane number of zero is assigned to which compound?

  • 2-Methyl octane
  • n-Heptane
  • Iso-octane
  • 3-Methyl octane
0 Comments
Correct Answer: B. n-Heptane

Explanation:

The octane number is a measure of the resistance of a fuel to ... Read More Details

2 Organic Chemistry MCQs

What is the most appropriate method for separating a large quantity of a mixture of nonvolatile, nonpolar organic compounds?

  • Distillation
  • Extraction
  • Gas chromatography
  • Column chromatography
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Correct Answer: D. Column chromatography

Explanation:

In organic chemistry, selecting the appropriate separation technique depends on the physical and ... Read More Details

3 Organic Chemistry MCQs

Which of the following solvents would best support an SN2 substitution reaction?

  • Water
  • Hexane
  • Dimethylformamide (DMF)
  • Ethanol
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Correct Answer: C. Dimethylformamide (DMF)

Explanation:

The choice of solvent plays a critical role in determining the rate of ... Read More Details

4 Organic Chemistry MCQs

When an aldehyde reacts with hydrogen cyanide (HCN), a cyanohydrin is formed. This process is best described as:

  • Electrophilic addition
  • Electrophilic substitution
  • Nucleophilic addition
  • Nucleophilic substitution
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Correct Answer: C. Nucleophilic addition

Explanation:

The reaction between aldehydes and hydrogen cyanide (HCN) is a classic example of ... Read More Details

5 Organic Chemistry MCQs

The relatively high energy of the gauche conformation of butane is mainly due to which type of strain?

  • Angle strain
  • Torsional strain
  • Steric strain
  • Orbital strain
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Correct Answer: C. Steric strain

Explanation:

In organic chemistry, the study of conformational analysis helps us understand how molecules ... Read More Details

6 Organic Chemistry MCQs

The chemical formula C₆H₅–CO–CH₃ represents which compound?

  • Acetone
  • Acetic acid
  • Acetophenone
  • Phenyl acetate
0 Comments
Correct Answer: C. Acetophenone

Explanation:

The compound with the chemical formula C₆H₅–CO–CH₃ is called acetophenone. It is an ... Read More Details

7 Organic Chemistry MCQs

Tetraethyl lead is used as:

  • Pain killer
  • Fire extinguisher
  • Mosquito repellent
  • Petrol additive
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Correct Answer: D. Petrol additive

Explanation:

Tetraethyl lead (TEL) is an organometallic compound with the chemical formula (C₂H₅)₄Pb. It ... Read More Details

8 Organic Chemistry MCQs

The chemical Ethyl Mercaptan, added to LPG cooking gas to give it a detectable smell, is a compound of:

  • Bromine
  • Fluorine
  • Chlorine
  • Sulphur
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Correct Answer: D. Sulphur

Explanation:

Ethyl Mercaptan, also known as ethanethiol (C₂H₅SH), is a chemical compound that contains ... Read More Details

9 Organic Chemistry MCQs

What is Marsh Gas?

  • Nitrogen
  • Ethane
  • Methane
  • Hydrogen
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Correct Answer: C. Methane

Explanation:

Marsh gas is the common name for methane (CH₄), which is the simplest ... Read More Details

10 Organic Chemistry MCQs

The reaction with Lucas reagent is fastest with which alcohol?

  • (CH₃)₂CHOH (Secondary alcohol)
  • CH₃(CH₂)OH (Long-chain primary alcohol)
  • CH₃CH₂OH (Primary alcohol)
  • (CH₃)₃COH (Tertiary alcohol)
0 Comments
Correct Answer: D. (CH₃)₃COH (Tertiary alcohol)

Explanation:

The Lucas test is a classical method in organic chemistry for distinguishing between ... Read More Details

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