Discriminate between - alkanes and alkenes using bromine water - primary, secondary and tertiary alcohols using acidified potassium dichromate (VI) and potassium manganate (VII).

A student carries out two tests on four unlabelled samples: hexane (an alkane), hex-1-ene (an alkene), butan-1-ol (a primary alcohol), and 2-methylpropan-2-ol (a tertiary alcohol). Identify which sample will show (i) decolourisation of bromine water, and (ii) no colour change with acidified potassium dichromate(VI).

A student conducts a test on an unknown organic compound using acidified potassium dichromate (VI). The orange dichromate solution turns green, and a secondary alcohol is formed. Which of the following statements correctly identifies the type of alcohol used?

A colourless organic liquid X is treated with acidified potassium dichromate (VI) solution. The orange dichromate slowly fades to green over several minutes, but no aldehyde smell is detected. Which of the following best describes the structure of X?