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Question

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

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

The correct option is B II, III, I
The correct sequence of increasing number of π-bonds is:
H2SO3(1)<H2S2O5(3)<H2S2O6(4)
The number inside the brackets indicates the number of π-bonds.

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