Identify the correct sequences of increasing number of  π-bonds in the structures of the following molecules:
(I) H2S2O6     (II) H2SO3     (III) H2S2O5
(1) I < II < III

(2) II < III < I
(3) II < I < III
(4) I < III < II

Answer: (2)
Explanation: 

Identify the correct sequences of increasing number of  π-bonds in the structures of the following molecules:
(I) H2S2O6     (II) H2SO3     (III) H2S2O5



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