Organic Reaction Mechanisms

JKPSC Assistant Professor (Chemistry) · Chemistry · 69 practice questions with answers and explanations: 9 Easy, 60 Medium, 0 Hard.

Sample questions

Sample Easy question 1

Aromaticity follows Hückel's rule of:

  1. (2n + 1) σ electrons
  2. 4n π electrons
  3. (4n + 2) π electrons
  4. 2n π electrons
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Answer: C. Benzene has 6 π electrons.

Sample Easy question 2

The compound with the highest acidity among these is:

  1. Chloroacetic acid
  2. Trichloroacetic acid
  3. Formic acid
  4. Acetic acid
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Answer: B. Electron-withdrawing chlorine stabilises the anion.

Sample Easy question 3

The IUPAC name of CH₃CH₂OH is:

  1. Ethanal
  2. Methanol
  3. Ethanol
  4. Propanol
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Answer: C. Two carbons with an –OH group.

Sample Medium question 4

The electrophile in the nitration of benzene is:

  1. HNO₃
  2. NO₃⁻
  3. NO₂⁺
  4. NO₂⁻
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Answer: C. It is generated by H₂SO₄ and HNO₃.

Sample Medium question 5

The Friedel–Crafts alkylation uses:

  1. An acid chloride only
  2. Water
  3. An alcohol and base
  4. An alkyl halide and AlCl₃
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Answer: D. It is prone to rearrangement.

Sample Medium question 6

The Friedel–Crafts acylation does not undergo:

  1. Reduction
  2. Substitution
  3. Addition
  4. Rearrangement
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Answer: D. The acylium ion is stabilised.

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