A) Pryosulphuric acid
B) Dithionic acid
C) Dithionous acid
D) Pyrosulphurous acid
Correct Answer: A
Solution :
Pyrosulphuric acid \[-{{\text{H}}_{\text{2}}}{{\text{S}}_{\text{2}}}{{\text{O}}_{\text{7}}}\] \[HO-\underset{\text{O}}{\overset{\text{O}}{\mathop{\underset{|\,|}{\overset{|\,|}{\mathop{S}}}\,}}}\,-O-\underset{\text{O}}{\overset{\text{O}}{\mathop{\underset{|\,|}{\overset{|\,|}{\mathop{S}}}\,}}}\,-OH\] does not contain S-S bond. Dithionic acid \[{{\text{H}}_{\text{2}}}{{\text{S}}_{\text{2}}}{{\text{O}}_{\text{6}}}\] \[HO-\underset{\text{O}}{\overset{\text{O}}{\mathop{\underset{|\,|}{\overset{|\,|}{\mathop{S}}}\,}}}\,-O-\underset{\text{O}}{\overset{\text{O}}{\mathop{\underset{|\,|}{\overset{|\,|}{\mathop{S}}}\,}}}\,-OH\] Contain S-S bond. Dithionous acid \[{{\text{H}}_{\text{2}}}{{\text{S}}_{\text{2}}}{{\text{O}}_{\text{4}}}\] \[HO-\overset{\text{O}}{\mathop{\overset{|\,|}{\mathop{S}}\,}}\,-\overset{\text{O}}{\mathop{\overset{|\,|}{\mathop{S}}\,}}\,-OH\] Contain S-S bond. Pyrosulphurous acid \[{{\text{H}}_{\text{2}}}{{\text{S}}_{\text{2}}}{{\text{O}}_{\text{5}}}\] \[HO-\underset{\text{O}}{\overset{\text{O}}{\mathop{\underset{|\,|}{\overset{|\,|}{\mathop{S}}}\,}}}\,-\overset{\text{O}}{\mathop{\overset{|\,|}{\mathop{S}}\,}}\,-OH\] Contain S-S bond.
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