57a) Write the reactions that make it possible to carry out the indicated transformations:
propionic acid → α-chloropropionic acid → lactic acid → (acetic acid) ?
b) Write the reactions occurring during the interaction:
1) potassium acetate and acetic acid chloride;
2) malonic acid and excess ethanol;
3) 1,3-propanediol and acetic anhydride (2 mol).
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