Which of the following oxoacid of sulphur has $$- O - O -$$ linkage?
A
$$H_2S_2O_8$$, peroxodisulphuric acid
B
$$H_2S_2O_7$$, pyrosulphuric acid
C
$$H_2SO_4$$, sulphuric acid
D
$$H_2SO_3$$, sulphurous acid
Correct option is B. $$H_2S_2O_8$$, peroxodisulphuric acid
$$OH-\overset{O}{\overset{||}{\underset{O}{\underset{||}{S}}}}-OH$$
$$H_2SO_4$$
$$OH-\overset{O}{\overset{||}{\underset{O}{\underset{||}{S}}}}-O-$$$$O-\overset{O}{\overset{||}{\underset{O}{\underset{||}{S}}}}-OH$$
$$H_2S_2O_8$$
$$HO-\overset{O}{\overset{||}{\underset{O}{\underset{||}{S}}}}$$$$-O-\overset{O}{\overset{||}{\underset{O}{\underset{||}{S}}}}-OH$$
$$H_2S_2O_7$$
$$OH-\overset{O}{\overset{||}{S}}-OH$$
$$H_2SO_3$$
As the structure shown $$H_2S_2O_8$$ contains $$-O-O-$$ linkage.
Option B is correct.