a, C2H4---->C2H5OH---->CH3COOH--->CH3COOC2H5--->CH3COONa b, C6H12O6--->C2H5OH--->CH3COOH---->CH3COOC2H5 C2H5OH--->C2H5ANa CH3COOH--->(CH3COO)3Al

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