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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 by-product of the process of saponification is ___________?

  • Methanol
  • Glycol
  • Glycerol
  • Sodium hydroxide
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Correct Answer: C. Glycerol

Explanation:

The process of saponification is the basic chemical reaction behind soap making. In ... Read More Details

2 Organic Chemistry MCQs

Polyethylene Glycols (PEGs) are used in the preparation of which type of detergents?

  • Cationic detergents
  • Anionic detergents
  • Non-ionic detergents
  • All of the above
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Correct Answer: C. Non-ionic detergents

Explanation:

Detergents are classified into anionic, cationic, non-ionic, and amphoteric types depending on the ... Read More Details

3 Organic Chemistry MCQs

Which type of surfactants perform well over a wide range of water hardness and pH?

  • Anionic
  • Cationic
  • Nonionic
  • Neutral
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Correct Answer: C. Nonionic

Explanation:

Surfactants are surface-active agents that reduce the surface tension of water and help ... Read More Details

4 Organic Chemistry MCQs

Commercial detergents mainly contain which of the following compounds?

  • RCOON
  • RONa
  • RSNa
  • R–OSO₃Na
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Correct Answer: A. RCOON

Explanation:

Detergents are cleansing agents that work by reducing surface tension and emulsifying oils, ... Read More Details

5 Organic Chemistry MCQs

In which of the following compounds is the carbon–carbon bond strength maximum?

  • CH₃–CH₃
  • CH₂=CH₂
  • Benzene
  • Cyclohexane
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Correct Answer: A. CH₃–CH₃

Explanation:

The strength of a chemical bond depends on the bond order, orbital overlap, ... Read More Details

6 Organic Chemistry MCQs

Which of the following effects best explains why o-nitrophenol is insoluble in water?

  • Inductive effect
  • Resonance effect
  • Intramolecular hydrogen bonding
  • Isomeric effect
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Correct Answer: C. Intramolecular hydrogen bonding

Explanation:

The solubility of organic compounds in water depends largely on their ability to ... Read More Details

7 Organic Chemistry MCQs

Which one of the following compounds is the most acidic?

  • Phenol
  • p-Nitrophenol
  • o-Nitrophenol
  • m-Nitrophenol
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Correct Answer: B. p-Nitrophenol

Explanation:

The acidity of phenolic compounds depends on the ability of the molecule to ... Read More Details

8 Organic Chemistry MCQs

When chlorine (Cl) is attached to a benzene ring, it shows which effects?

  • +I and +R effect
  • –I and +R effect
  • +I and –R effect
  • –I and –R effect
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Correct Answer: B. –I and +R effect

Explanation:

When a substituent such as chlorine (Cl) is attached to a benzene ring, ... Read More Details

9 Organic Chemistry MCQs

What is the main criterion for a compound to be aromatic?

  • Unsaturations
  • Cyclic structure
  • Presence of 4nπ electrons
  • Presence of 4n+2π electrons
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Correct Answer: D. Presence of 4n+2π electrons

Explanation:

Aromatic compounds are a special class of organic molecules that show unusual stability ... Read More Details

10 Organic Chemistry MCQs

Which of the following haloalkanes is hydrolyzed by the SN1 mechanism?

  • CH₃Br
  • CH₃CH₂Br
  • CH₃CH₂CH₂Br
  • (CH₃)₃CBr
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Correct Answer: D. (CH₃)₃CBr

Explanation:

The SN1 reaction mechanism (Substitution Nucleophilic Unimolecular) is a two-step process commonly observed ... Read More Details

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