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1 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

2 Organic Chemistry MCQs

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

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

Explanation:

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

3 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

4 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

5 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

6 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

7 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

8 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

9 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

10 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

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