Identify the correct sequence of increasing number of `pi`-bonds in the structure of the following molecules:
(I)`H_(2)S_(2)O_(6)` (II)`H_(2)S_(2)O_(3)` (III)`H_(2)S_(2)S_(5)`

Options

A. I,II,III
B. II,III,I
C. II,I,III
D. I,III,II

Answer

B

Explanation

`H_(2)S_(2)O_(6), H-O-underset(underset(O)||)overset(overset(O)||)S-underset(underset(O)||)overset(overset(O)||)S-OH=4pi-" bonds "`
`H_(2)SO_(3), HO-overset(overset(O)||)S-OH =1pi-" bond "`
`H_(2)S_(2)O_(5), HO-underset(underset(O)||)overset(overset(O)||)S-underset(underset(O)||)S-OH=3pi-" bonds "`