(C) The given reaction is the reductive ozonolysis of $2-butyne$.In the first step,$2-butyne$ reacts with ozone $(O_3)$ to form an ozonide intermediat

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(C) The given reaction is the reductive ozonolysis of $2-butyne$.In the first step,$2-butyne$ reacts with ozone $(O_3)$ to form an ozonide intermediate.In the second step,the ozonide is reduced by $Zn/H_2O$ to form $butane-2,3-dione$ $(CH_3-CO-CO-CH_3)$.Therefore,$X$ is $O_3$.