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1 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

2 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

3 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

4 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

5 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

6 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

7 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

8 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

9 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

10 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

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