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Which is the most economical process for manufacturing acetaldehyde?

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Which is the most economical process for manufacturing acetaldehyde?

(a) Hydration of acetylene

(b) Hydration of acetic acid

(c) Hydration of formic acid

(d) Hydration of ethylene

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This interesting question is from C2 Compounds topic in chapter Synthetic Organic Chemical Industries of Chemical Technology

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The correct choice is (d) Hydration of ethylene

Easy explanation: Hydration of ethylene is the most economical process as ethylene is cheaper than acetylene. Hence acetaldehyde is produced from ethylene and water using cupric chloride as catalyst.

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