Question

Which of the following has $ - O - O - $ linkage?
(A) $ {H_2}{S_2}{O_6} $
(B) $ {H_2}{S_2}{O_8} $
(C) $ {H_2}{S_2}{O_3} $
(D) $ {H_2}{S_4}{O_6} $

Answer 1

Hint :To answer this question, we first need to understand what is linkage. Two or more coordination compounds in which at least one of the ligands has a distinct donor atom are called linkage isomers (i.e., the connectivity between atoms is different). Linkage isomers aren't found in all coordination molecules. Physical and chemical features of linkage isomers differ.

Complete Step By Step Answer:
Isomers - Isomers in chemistry are molecules or polyatomic ions that have the same molecular formula that is, the same number of atoms of each element — but different atomic configurations in space. Isomerism refers to the existence or potential of isomers.
Isomers don't always have the same chemical or physical properties as one another. Structural or constitutional isomerism, in which the bonds between the atoms differ, and stereoisomerism or spatial isomerism, in which the bonds are the same but the relative positions of the atoms differ, are the two basic types of isomerism.
A hierarchy of isomeric relationships exists. Two compounds may have the same constitutional isomer but are stereoisomers of each other when examined further. Two molecules with the same stereoisomer but different conformational forms or isotopologues could be in various conformational forms or be different isotopologues. The scope of the investigation is determined by the topic of study or the chemical and physical qualities that are of interest.
Structures of all the compounds are drawn below -

Here we can see that only $ {H_2}{S_2}{O_8} $ has $ - O - O - $ linkage
So, the final answer is option (B) i.e., $ {H_2}{S_2}{O_8} $ .

Note :
Isomerization is the process by which one molecule is changed into another molecule with the same atoms but rearranged atoms. Isomerization happens spontaneously in some compounds and under certain conditions. Many isomers have bond energies that are equal or nearly equal, and so exist in roughly equal amounts if they can interconvert relatively freely, that is, if the energy barrier between the two isomers is not too large. It is referred to as a rearrangement process when the isomerization occurs intramolecularly.