Chirality and optical isomerism Quiz
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5 questions, one answer each
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1. Which compound has a chiral centre?
- A. CH₃CH₂CH₂OH
- B. (CH₃)₂CHOH
- C. CH₃CH(Cl)CH₂CH₃
- D. CH₃CH₂CH₃
2. What is a racemic mixture?
- A. A mixture of two different compounds
- B. An equal mixture of two enantiomers
- C. A single enantiomer
- D. A mixture of structural isomers
3. A pure enantiomer in a polarimeter rotates plane-polarised light by +20°. A racemic mixture of the same compound would give a reading of:
- A. +20°
- B. −20°
- C. +10°
- D. 0°
4. Hydrolysis of a single enantiomer of a halogenoalkane gives an optically inactive product. This is evidence for:
- A. SN2 with inversion
- B. Free-radical substitution
- C. SN1 via a planar carbocation
- D. Elimination
5. Why is the reaction of HCN with propanal not stereospecific?
- A. The carbonyl carbon is planar, so attack is equally likely from either side
- B. CN⁻ is a poor nucleophile
- C. The product has no chiral centre
- D. The reaction is SN2