(B) $1$. The starting material $ClCH_2-CH_2Cl$ ($1$,$2$-dichloroethane) undergoes dehydrohalogenation with alcoholic $KOH$ followed by $NaNH_2$ to for

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(B) $1$. The starting material $ClCH_2-CH_2Cl$ ($1$,$2$-dichloroethane) undergoes dehydrohalogenation with alcoholic $KOH$ followed by $NaNH_2$ to form $A$,which is ethyne $(HC \equiv CH)$.$2$. When ethyne is passed through a red hot iron tube,it undergoes cyclic polymerization to form $B$,which is benzene $(C_6H_6)$.