Question

Identify the correct sequence of increasing number of `pi-bonds` in strcutures of the following molecules.
(I) `H_2 S_2 O_6`
(II) `H_2 SO_3`
(III) `H_2 S_2 O_5`.
A. `(I),(II),(III)`
B. `(II),(III),(I)`
C. `(II),(I),(III)`
D. `(I),(III),(II)`

Answer 1

Correct Answer - B
`H_(2)S_(2)O_(6), H-O-underset(O) underset(||) overset(O) overset(||) S-underset(O) underset(||) overset(O)overset(||)S-OH = 4 pi - bonds`
`H_2 SO_3, HO- overset(O) overset(||)S-OH = on e pi-bond`
`H_2S_2O_5, HO-overset(O) overset(||) underset(O) underset(||)S-underset(O) underset(||) S-OH = 3 pi-bonds`.