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

Answer

C

Explanation

`underset(I)(OH-overset(O)overset(||)underset(O)underset(||)(S)-overset(O)overset(||)underset(O)underset(||)(S)-OH)` `underset(II)(OH-overset(O)overset(||)underset(O)underset(||)(S)-OH)` `underset(III)(HO-overset(O)overset(||)underset(O)underset(||)(S)-overset(O)overset(||)underset(..)(S)-OH`