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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

Why is the Grignard reagent highly reactive?

  • Because of the presence of a halogen atom
  • Because of the presence of a magnesium atom
  • Because of the polarity of the C–Mg bond
  • All of the above
0 Comments
Correct Answer: C. Because of the polarity of the C–Mg bond

Explanation:

Grignard reagents, with the general formula R–MgX (where R is an alkyl or ... Read More Details

2 Organic Chemistry MCQs

The ether used in Wurtz synthesis is ?

  • Diethyl ether
  • Dimethyl ether
  • Ethyl methyl ether
  • Phenyl ether
0 Comments
Correct Answer: A. Diethyl ether

Explanation:

The Wurtz synthesis is a well-known organic reaction used for the preparation of ... Read More Details

3 Organic Chemistry MCQs

Which one of the following species is not an electrophile?

  • NH₃
  • Br⁺
  • H⁺
  • BF₃
0 Comments
Correct Answer: A. NH₃

Explanation:

In organic chemistry, species are classified as electrophiles or nucleophiles based on how ... Read More Details

4 Organic Chemistry MCQs

Ethyl magnesium bromide + acetone (then hydrolysis) gives which alcohol?

  • Primary alcohol
  • Secondary alcohol
  • Tertiary alcohol
  • Dihydric alcohol
0 Comments
Correct Answer: C. Tertiary alcohol

Explanation:

Grignard reagents are versatile organometallic compounds used widely in organic synthesis to form ... Read More Details

5 Organic Chemistry MCQs

Which one of the following molecules does not form alcohol when it reacts with a Grignard reagent?

  • Formaldehyde
  • Acetaldehyde
  • Propanone
  • Carbon dioxide
0 Comments
Correct Answer: D. Carbon dioxide

Explanation:

Grignard reagents are highly reactive organometallic compounds of the form R–MgX, where R ... Read More Details

6 Organic Chemistry MCQs

In primary alkyl halides, the halogen-bearing carbon is bonded to how many other carbons?

  • Two
  • Three
  • One
  • Four
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Correct Answer: C. One

Explanation:

Primary alkyl halides form a major class of organic compounds that play an ... Read More Details

7 Organic Chemistry MCQs

The best method for the preparation of alkyl halides is the reaction of alcohol with:

  • Zn / HCl
  • SOCl₂ / Pyridine
  • PCl₃
  • PCl₅
0 Comments
Correct Answer: B. SOCl₂ / Pyridine

Explanation:

Alkyl halides can be prepared from alcohols by replacing the hydroxyl group (–OH) ... Read More Details

8 Organic Chemistry MCQs

In which reaction does 50% inversion of configuration take place?

  • E1 reaction
  • E2 reaction
  • SN1 reaction
  • SN2 reaction
0 Comments
Correct Answer: C. SN1 reaction

Explanation:

The stereochemistry of nucleophilic substitution depends on the mechanism involved. The two main ... Read More Details

9 Organic Chemistry MCQs

Which alkyl halide has the highest reactivity for a particular alkyl group?

  • R–F
  • R–Cl
  • R–Br
  • R–I
0 Comments
Correct Answer: D. R–I

Explanation:

The reactivity of alkyl halides in nucleophilic substitution reactions mainly depends on the ... Read More Details

10 Organic Chemistry MCQs

Which one of the following is not a nucleophile?

  • C₂H₅O⁻
  • SCN⁻
  • NH₃
  • CH₃⁺
0 Comments
Correct Answer: D. CH₃⁺

Explanation:

In organic chemistry, a nucleophile is a species that donates an electron pair ... Read More Details

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