a)
$3C_2H_2 \xrightarrow{t^o,p,xt} C_6H_6$
$C_6H_6 + Br_2 \xrightarrow{t^o,Fe} C_6H_5Br + HBr$
$C_6H_5Br + 2NaOH \to C_6H_5ONa + NaBr + H_2O$
$C_6H_5ONa + CO_2 + H_2O \to C_6H_5OH + NaHCO_3$
$C_6H_5OH + KOH \to C_6H_5OK + H_2O$
$C_6H_5OH + 3Br_2 \to C_6H_2Br_3OH + 3HBr$
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