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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

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

2 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

3 Organic Chemistry MCQs

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

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

Explanation:

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

4 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

5 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

6 Organic Chemistry MCQs

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

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

Explanation:

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

7 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

8 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

9 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

10 Organic Chemistry MCQs

Which alkyl halide may follow both SN1 and SN2 mechanisms?

  • CH₃–X
  • (CH₃)₃C–CH₂–X
  • (CH₃)₂CH–X
  • (CH₃)₃C–X
0 Comments
Correct Answer: C. (CH₃)₂CH–X

Explanation:

The mechanism of nucleophilic substitution in alkyl halides depends strongly on the structure ... Read More Details

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