Stereoisomers (Unit 4)

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1. Define a racemic mixture

  • contains only 1 enantiomer of an optically active compound
  • contains equal quantities of each enantiomer of an optically active compound (50/50)
  • contains similar quantites of each enantiomer of an optically active compound
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2. Why?

  • because planar ion can be attcked by nucleophile from either side
  • because planar ion can only be attacked by nucleophile from one side
  • because thats how chemistry works

3. What must a compund have to create a optical isomer?

  • at least 1 hydrogen attched to a carbon
  • Chiral centre
  • 3 different groups attached to a carbon

4. Which mechanism produces two type of optical isomer?

  • Sn1 Mechanism
  • Electrophilic addition
  • Sn2 Mechanism
  • Nucleophilic addition

5. How many types of steorisomers are there?

  • 2
  • 1
  • 3
  • 19

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