(D) The reaction of calcium carbide $(CaC_2)$ with water $(H_2O)$ is a standard laboratory method for the preparation of acetylene ($C_2H_2$ or $CH \e

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(D) The reaction of calcium carbide $(CaC_2)$ with water $(H_2O)$ is a standard laboratory method for the preparation of acetylene ($C_2H_2$ or $CH \equiv CH$).The balanced chemical equation is:$CaC_2 + 2H_2O \to CH \equiv CH + Ca(OH)_2$Therefore,the correct option is $(D)$.