A) chlorosulphuric acid
B) sulphurous acid
C) sulphuryl chloride
D) thionyl chloride.
Correct Answer: C
Solution :
: \[\underset{Sulphuric\,acid}{\mathop{HO-S{{O}_{2}}-OH}}\,\xrightarrow[-POC{{l}_{3}}-HCl]{PC{{l}_{5}}}\] \[\underset{\begin{smallmatrix} Chlorosulphonic \\ acid \end{smallmatrix}}{\mathop{HO-S{{O}_{2}}-Cl}}\,\xrightarrow[-POC{{l}_{3}}-HCl]{PC{{l}_{5}}}\underset{\begin{smallmatrix} Sulphuryl \\ chloride \end{smallmatrix}}{\mathop{S{{O}_{2}}C{{l}_{2}}}}\,\]
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