Acetylene can be prepared from

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(D) $1.$ Kolbe's electrolysis of potassium fumarate yields acetylene. $2.$ Hydrolysis of calcium carbide $(CaC_2 + 2H_2O \rightarrow Ca(OH)_2 + CH \eq

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All of these

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(D) $1.$ Kolbe's electrolysis of potassium fumarate yields acetylene. $2.$ Hydrolysis of calcium carbide $(CaC_2 + 2H_2O \rightarrow Ca(OH)_2 + CH \equiv CH)$ produces acetylene. $3.$ Dehydrohalogenation of ethylene bromide $(Br-CH_2-CH_2-Br)$ using alcoholic $KOH$ also yields acetylene. Therefore,all the given options are correct.

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