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| Column-$1$ (Reaction) | Column-$2$ (Main product) |
| $A$. $SO_3 \xrightarrow{D_2O}$ | $I$. $C_2D_2$ |
| $B$. $CaC_2 \xrightarrow{D_2O \text{ (excess)}}$ | $II$. $CD_4$ |
| $C$. $Al_4C_3 \xrightarrow{D_2O \text{ (large excess)}}$ | $III$. $D_2SO_3$ |
| $IV$. $C_2D_4$ | |
| $V$. $D_2SO_4$ |
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