In the following reaction,$A$ and $B$ respectively are:
$A$ $\xrightarrow{HBr} C_2H_5Br$ $\xrightarrow{B} A$
$A$ $\xrightarrow{HBr} C_2H_5Br$ $\xrightarrow{B} A$
- A$C_2H_4$ and alcoholic $KOH / \Delta$
- B$C_2H_5Cl$ and aqueous $KOH / \Delta$
- C$C_2H_2$ and $PBr_3$
- DNone of these
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