CHEMISTRY PAPER 2

• test to differentiate: Hexane and Hex-2-ene


  REAGENT: bromine water Br2

  HEX-2-ENE: orange to colourless

  hexane: no visible change
• test to differentiate propanone and propanal:

  REAGENT: tollens reagent

  propanal : silver mirror should form

  propanone: no visible change
• test to differentiate propan-2-ol and 2-methylpropan-2-ol:

  -REAGENT: acidified potassium dichromate k2cr2o7

  -propan-2-ol: orange to green (primary or secondary)

  -2-methylpropan-2-ol: no visible change
• Iodoethane and ethanoic acid :

  REAGENT:sodium carbonate (na2co3)

  IODOETHANE: no visible change

  ETHANOIC ACID: effervescence
• acidified potassium dichromate can be used for ...

  -aldehyde or primary or secondary alcohol
• what is 2-4 DNP used for?

  to test for ketones or aldehydes (co) to form an orange ppt