AQA Chemistry A-level 3.3.7: Optical Isomers Detailed Notes

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Questions and Answers

What is optical isomerism?

  • A type of geometric isomerism
  • A type of functional group isomerism
  • A type of structural isomerism
  • A type of stereoisomerism with different spatial arrangements of atoms (correct)

What defines a chiral centre in an organic molecule?

  • It has two identical groups bonded around it
  • It has a line of symmetry
  • It has three different groups bonded around it
  • It has four different groups bonded around it (correct)

How many possible isomers are present when a molecule contains a chiral centre?

  • Three
  • Four
  • Two (correct)
  • One

What term describes the two different isomers that are mirror images of each other?

<p>Enantiomers (B)</p> Signup and view all the answers

How do enantiomers affect plane polarised light?

<p>They rotate the light by 90 degrees in opposite directions (C)</p> Signup and view all the answers

What is formed when optical isomers are produced as a pair of enantiomers in a 1:1 ratio?

<p>Racemic mixture (A)</p> Signup and view all the answers

What symbol is commonly used to indicate a chiral centre?

<ul> <li>(B)</li> </ul> Signup and view all the answers

What structural feature leads to the formation of optical isomers?

<p>Asymmetrical carbon with four different groups around it (A)</p> Signup and view all the answers

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