Stereochemistry, Aromaticity and Intermediates

JKPSC Assistant Professor (Chemistry) · Chemistry · 50 practice questions with answers and explanations: 2 Easy, 48 Medium, 0 Hard.

Sample questions

Sample Easy question 1

A racemic mixture is:

  1. A pure enantiomer
  2. A mixture of two diastereomers
  3. An equimolar mixture of two enantiomers
  4. A meso compound
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Answer: C. It is optically inactive.

Sample Easy question 2

Optical isomers rotate:

  1. X-rays
  2. Gamma rays
  3. Plane-polarised light
  4. Sound
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Answer: C. Enantiomers rotate light in opposite directions.

Sample Medium question 3

The stability of free radicals follows the order:

  1. Methyl > 1°
  2. 3° > 2° > 1° > methyl
  3. All equal
  4. 1° > 2° > 3°
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Answer: B. Hyperconjugation stabilises them.

Sample Medium question 4

A carbene is:

  1. A neutral species with a divalent carbon
  2. An anion
  3. A radical
  4. A cation
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Answer: A. :CH₂ is the simplest.

Sample Medium question 5

A singlet carbene has:

  1. Paired electrons in one orbital
  2. One electron
  3. Two unpaired electrons
  4. No electrons
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Answer: A. It is sp² hybridised.

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