The correct option is
A H2S2O8The compound contains a peroxy linkage when:
Calculated oxidation state is more the maximum oxidation state possible.
(a)
H2S2O8
Let oxidation state of Sulphur be
x.
⇒2x+2×(+1)+8×(−2)=0
⇒x=+7
calcualted O.S.
=+7.
while maximum O.S. possible for sulphur is +6 so,
H2S2O8 contains a peroxy linkage.
The structure of
H2S2O8,
(b)
H2S2O4
Let oxidation state of Sulphur be
x.
⇒2x+2×(+1)+4×(−2)=0
⇒x=+3
calcualted O.S.
=+3.
while maximum O.S. possible for sulphur is +6 so,
H2S2O4 does not contains a peroxy linkage.
The structure of
H2S2O4,
(c)
H2S2O6
Let oxidation state of Sulphur be
x.
⇒2x+2×(+1)+6×(−2)=0
⇒x=+5
calcualted O.S.
=+5.
while maximum O.S. possible for sulphur is +6 so,
H2S2O6 does not contains a peroxy linkage.
The structure of
H2S2O6,
(a) is the correct answer.