1.1. Draw the displayed formula of the functional group isomer of butanone.

1.2. Explain why butanone has no positional isomers.

1.3. Draw the organic product, where appropriate, for the reaction of butanal with:

i) Sodium tetrahydridoborate, NaBH₄.

ii) Ammoniacal silver nitrate solution.

1.4. Name the organic product, where appropriate, for the reaction of butanone with:

i) An excess of acidified potassium dichromate(VI) solution, K₂Cr₂O₇, under reflux.

ii) Lithium tetrahydridoaluminate, LiAlH₄.