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)₃CBr
- C. CH₃CHClCH₃
- D. CH₃CH(OH)CH₂CH₃
2. A solution contains equal amounts of two enantiomers. What is the observed rotation?
- A. Zero
- B. Equal to one pure enantiomer
- C. Twice that of one pure enantiomer
- D. Unpredictable
3. A single optically active tertiary halogenoalkane is hydrolysed by SN1. What is the product?
- A. A racemic mixture
- B. A single enantiomer with inverted configuration
- C. A single enantiomer with the same configuration
- D. A mixture of structural isomers
4. A pure enantiomer gives +8.0°. A mixture of 90% of it and 10% of the other enantiomer is measured at the same total concentration. What is the rotation?
- A. +8.0°
- B. +7.2°
- C. +6.4°
- D. +0.8°
5. Which statement about an SN2 reaction of a single optically active halogenoalkane is correct?
- A. The product is always racemic
- B. The product is a single enantiomer with the configuration inverted
- C. The product has the same configuration as the reactant
- D. A planar carbocation forms