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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 D I, III, II
H2S2O6 HOO||S||OO||S||O 4πbonds

H2SO3 HOO||S||OH 1πbonds

H2S2O5 HOO||S||OO||SOH 3πbonds

Hence, option D is correct.

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