A) Sulphurous acid
B) Pyrosulphuric acid
C) Dithionic acid
D) Caro's acid
Correct Answer: D
Solution :
[d] Caro's acid is \[{{H}_{2}}S{{O}_{5}}\] which contains one \[S-O-O-H\] peroxy linkage. It is also known as permonosulphuric acids. \[\underset{Caro's\,acid}{\mathop{H-O-O-\underset{O}{\overset{O}{\mathop{\underset{||}{\overset{||}{\mathop{S}}}\,}}}\,-OH}}\,\]
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