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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

When 2 moles of ethyl chloride react with 2 moles of sodium in dry ether, the product is:

  • 2 moles of ethane
  • 1 mole of ethane
  • 2 moles of butane
  • 1 mole of butane
0 Comments
Correct Answer: D. 1 mole of butane

Explanation:

The given reaction is an example of the Wurtz reaction, a classical organic ... Read More Details

2 Organic Chemistry MCQs

CO₂ with ethyl magnesium iodide and hydrolysis gives:

  • Propane
  • Propanoic acid
  • Propanal
  • Propanol
0 Comments
Correct Answer: B. Propanoic acid

Explanation:

Grignard reagents are one of the most important tools in organic synthesis. They ... Read More Details

3 Organic Chemistry MCQs

The SN2 reaction can be best carried out with which type of alkyl halide?

  • Primary alkyl halide
  • Secondary alkyl halide
  • Tertiary alkyl halide
  • All
0 Comments
Correct Answer: A. Primary alkyl halide

Explanation:

The SN2 reaction (bimolecular nucleophilic substitution) is a single-step reaction in which a ... Read More Details

4 Organic Chemistry MCQs

For which of the following reaction mechanisms is the first step the same?

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

Explanation:

Organic reaction mechanisms such as substitution (SN1, SN2) and elimination (E1, E2) differ ... Read More Details

5 Organic Chemistry MCQs

Which one of the following reactants gives a straight-chain alcohol when reacted with a Grignard reagent followed by hydrolysis?

  • Formaldehyde
  • Ketone
  • Ethylene oxide
  • Both A & C
0 Comments
Correct Answer: D. Both A & C

Explanation:

Grignard reagents (R–MgX) are highly reactive organometallic compounds that react with many electrophiles ... Read More Details

6 Organic Chemistry MCQs

When ethylene oxide is treated with a Grignard reagent followed by acid hydrolysis, it yields which compound?

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

Explanation:

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

7 Organic Chemistry MCQs

Alkyl halides usually undergo which type of reaction?

  • Nucleophilic substitution
  • Nucleophilic addition
  • Elimination
  • Both A & C
0 Comments
Correct Answer: D. Both A & C

Explanation:

Alkyl halides, also called haloalkanes, are organic compounds in which a halogen atom ... Read More Details

8 Organic Chemistry MCQs

Which one of the following is known as Benzyl alcohol?

  • C₆H₅OH
  • C₆H₅CH(OH)₂
  • C₆H₅CH₂OH
  • C₆H₅COOH
0 Comments
Correct Answer: C. C₆H₅CH₂OH

Explanation:

Benzyl alcohol is an important aromatic alcohol with the molecular formula C₆H₅CH₂OH. It ... Read More Details

9 Organic Chemistry MCQs

Which one of the following is also known as tartaric acid?

  • 2,3-dihydroxybutanedioic acid
  • Oxalic acid
  • Succinic acid
  • Citric acid
0 Comments
Correct Answer: A. 2,3-dihydroxybutanedioic acid

Explanation:

Tartaric acid is a naturally occurring organic acid that is widely distributed in ... Read More Details

10 Organic Chemistry MCQs

The residue left after sugar crystallization from sugarcane juice is called?

  • Jaggery
  • Molasses
  • Treacle
  • Glucose syrup
0 Comments
Correct Answer: B. Molasses

Explanation:

When sugar is produced from sugarcane juice, the process involves concentration, clarification, and ... Read More Details

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