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In the following reactions, identify the...

In the following reactions, identify the compounds `A, B, C` and `D`.
(i) `PCl_5 + SO_2 rarr A + B`
(ii) `A + MeCOOH rarr C + SO_2 + HCl`
(iii) `2C + Me_2 Cd rarr 2D + CdCl_2`.

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