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(C) The reaction involves the nucleophilic aromatic substitution $(S_NAr)$ of $1,2,4,5$-tetrachlorobenzene with hydroxide ions. Initially,one $OH^-$ i

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(C) The reaction involves the nucleophilic aromatic substitution $(S_NAr)$ of $1,2,4,5$-tetrachlorobenzene with hydroxide ions. Initially,one $OH^-$ ion replaces one $Cl$ atom to form $2,4,5$-trichlorophenol. Subsequently,another $OH^-$ ion deprotonates the phenol to form a phenoxide ion. This phenoxide ion then attacks another molecule of $1,2,4,5$-tetrachlorobenzene,leading to the formation of a dibenzo-p-dioxin derivative. Specifically,the reaction of $2$ moles of $1,2,4,5$-tetrachlorobenzene with $4$ moles of $OH^-$ yields $2,3,7,8$-tetrachlorodibenzo-p-dioxin as the major product $A$.

Product $A$ of the given reaction is

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