Question

the no. of s-o linkage (s) in Caro's acid is-

Answer 1

Caro's acid ((H2SO5) is also known as Peroxymonosulfuric acid or as persulfuric acid, and also as, peroxysulfuric acid. In Caro's acid, the central atom is the 'Sulphur', which adopts a characteristic tetrahedral geometry. The linkage of the atoms is represented by the formula HO–O–S(O)2–OH, where the two oxygens are connected by a double bond each to the 'S' atom. It is a very oxidant and is highly explosive.

So, the central sulphur 'S' atom is directly connected to 4 oxygens. Of these 4 oxygen atoms, 2 oxygen atoms (O) are connected to the Sulphur atom by double bonds. One oxygen is connected to the Sulphur atom and it forms another bond with the Hydrogen atom (H) to form an OH linkage. On the other side, another oxygen forms a single bond with sulphur and the Oxygen atom is connected to another oxygen atom, to form a peroxy linkage.

So, if all the oxygens are to be considered, then there are 4 S-O linkages in Caro's acid.