Ethanol, C₂H₅OH, can be oxidised by acidified potassium dichromate(VI).
(a) Name the type of reaction occurring when ethanol is partially oxidised.
(b) Write a half-equation for the reduction of dichromate(VI) ions, Cr₂O₇²⁻, to Cr³⁺ ions in acidic conditions.
(c) Describe the chemical test you would use to distinguish between ethanol and ethanal. State the result for each compound.