Test for organic functional groups

• What is the test for an alkene?

  . Add bromine water

  Results :

  . Solution turns from orange to colourless
• What are the tests for Aldehydes?

  . Add 10 drops of sample to test tube

  . Add 10 drops of tollen’s reagent to test tube and heat gently

  Result :

  . Silver mirror forms in the test tube
• 2nd test for aldehyde

  . Add 1cm3 of feelings A into test tube

  . Add feelings B into test tube until the blue ppt dissolves

  . Add few drops of sample into the test tube

  . Heat gently in water bath

  Results :

  . solution will turn red if aldehyde is present
• What is the test for a carboxylic acid?

  . Add 0.5cm3 of ample to test tube

  . Add solid sodium carbonate to test tube

  Results :

  . If carboxylic acid is present the solution will fizz
• What is the test for halogenoalkanes?

  . Add 3 drops of sample into test tube

  . Add 4cm3 of silver nitrate to each test tube

  . Quickly add all 3 test tubes into warm water bath

  . See how fast the different solutions form a ppt

  Results :

  . The faster the ppt forms, the more reactive the halogen in the alkane

  . Iodo - fast

  . Bromo - slower

  . Chloro - even slower

  . Etc - slow