1) Draw the acetal produced when ethanol adds to ethanal.

2) Draw the major organic product formed when 2-butanone undergoes a reaction with NaBH₄.

3) Predict the organic product formed when heptan-3-one undergoes reaction with LiAlH₄.

4) Reduction of 1-phenylpropan-1-one using NH2NH2 and HO-, heat:

Draw the structure of the product formed when 1-phenylpropan-1-one is heated with NH₂NH₂ under basic conditions.