Alcohols -2

HideShow resource information
  • Created by: Shannon
  • Created on: 09-05-14 14:03
View mindmap
  • Alcohols
    • Classification
      • Primary
        • The carbon which is attached to -OH group is also attached to another carbon.
        • E.g ethanol
      • Secondary
        • The carbon which is attached to -OH group is also attached to 2 other carbons.
        • E.g propan-2-ol
      • Tertiary
        • The carbon which is attached to -OH group is also attached to 3 other carbons.
        • E.g 2-methylpropan-2-ol
    • Reactions
      • Oxidation
        • Primary alcohols
          • Alcohol -> Aldehyde -> Carboxylic acid
        • Secondary alcohols
          • Alcohol -> Ketone
        • Tertiary alcohols
          • Cannot be oxidised
      • With sodium
        • Observe bubbles of H2 gas
        • Sodium sinks
      • With PCl5 - test for -OH group
        • Substitution reaction occurs - form halogenoalkane
        • Test the gas given off using damp blue litmus paper
          • Litmus paper will turn red in the presence of HCl
      • Combustion
        • Alcohols burn with a clean flame, as they are already partially oxidised
      • Oxidation using potassium dichromate
        • Oxidised with dichromate & acid
        • Reaction occurs with primary & secondary alcohols
          • Colour change observed
            • Orange -> green
    • Solubility
      • Decreases as chain length increases
      • Depends on the relative size of the hydrophobic end
        • As hydrophobic end increases in size the favourable reactions at the hydrophilic end are outweighed

Comments

No comments have yet been made

Similar Chemistry resources:

See all Chemistry resources »See all Functional Groups resources »