C2H4→C2H5OH→CH3CHO→CH3COOH→(CH3COO)2Ca
C2H4+...→C2H5OH
C2H5OH+...→CH3CHO
CH3CHO+...→(CH3COO)2Ca

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This is the general outline of the chemical reactions that take place to convert ethylene (C2H4) into calcium acetate ((CH3COO)2Ca). The specific reagents and conditions needed for each step would depend on the actual reaction mechanisms employed in the conversion process.

Ethylene (C2H4) is first converted to ethanol (C2H5OH) through a process known as hydration. This reaction typically involves the use of a catalyst such as sulfuric acid or phosphoric acid.

Ethanol (C2H5OH) is then oxidized to acetaldehyde (CH3CHO) using an oxidizing agent such as potassium dichromate or copper oxide.

Acetaldehyde (CH3CHO) undergoes further oxidation to form acetic acid (CH3COOH) with the help of a suitable oxidizing agent like potassium permanganate or chromic acid.

Finally, calcium acetate ((CH3COO)2Ca) is produced by reacting acetic acid (CH3COOH) with calcium carbonate (CaCO3) or calcium hydroxide (Ca(OH)2).

It is important to note that in an industrial setting, each of these reactions may involve specific catalysts, reaction conditions, and purification steps to optimize the process and yield high-quality products.