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Optical Isomers quiz

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Terms in this set (15)

  • What is a chiral molecule?
    A chiral molecule contains a carbon atom connected to four different groups. This unique arrangement allows it to exhibit optical activity.
  • What is optical activity in chemistry?
    Optical activity is the ability of a chiral molecule to rotate plane-polarized light. This rotation can be either to the left or right.
  • What device is used to measure the rotation of polarized light by chiral molecules?
    A polarimeter is used to measure the observed rotation (alpha) of polarized light by chiral molecules. It determines the degree and direction of rotation.
  • What does a positive observed rotation indicate about a chiral solution?
    A positive observed rotation means the solution bends light to the right, or clockwise. This is called dextrorotatory (d).
  • What is the term for a chiral compound that bends light to the left?
    A chiral compound that bends light to the left is called levorotatory (l). It has a negative observed rotation and rotates light counterclockwise.
  • What are enantiomers?
    Enantiomers are pairs of chiral molecules that are mirror images of each other. They bend light in completely opposite directions.
  • What physical properties do enantiomers share?
    Enantiomers have the same boiling point, melting point, density, formula, mass, and connections. The only differences are their configurations and the direction they bend light.
  • What are the two differences between enantiomers?
    Enantiomers differ in their configurations and the direction of their observed rotation. One bends light to the left, the other to the right.
  • Does the direction of light rotation depend on the chirality of the compound?
    No, the direction of light rotation does not directly depend on the chirality; compounds with the same configuration can have opposite observed rotations.
  • What is dextrorotatory and how is it denoted?
    Dextrorotatory refers to a compound that bends light to the right (clockwise). It is denoted by lowercase 'd' and has a positive observed rotation.
  • What is levorotatory and how is it denoted?
    Levorotatory refers to a compound that bends light to the left (counterclockwise). It is denoted by lowercase 'l' and has a negative observed rotation.
  • How can you determine if a compound is optically active?
    A compound is optically active if it contains a chiral center. This means it can rotate plane-polarized light.
  • What happens to regular light when it passes through a solution of a chiral molecule?
    Regular light is bent either to the left or right when it passes through a solution of a chiral molecule. This bending is measured as optical activity.
  • What is the significance of the observed rotation value in optical isomers?
    The observed rotation value indicates the degree and direction (left or right) that a chiral compound bends polarized light. Positive values mean right, negative mean left.
  • What is the relationship between configuration and observed rotation in chiral compounds?
    The configuration of a chiral center does not always predict the direction of observed rotation. Compounds with the same configuration can have different observed rotations.