1.

Identify the correct sequence of increasing number of \[\pi \]-bonds in structure of following molecules. (I) \[{{H}_{2}}{{S}_{2}}{{O}_{6}}\]     (II)\[{{H}_{2}}S{{O}_{3}}\]  (III)\[{{H}_{2}}{{S}_{2}}{{O}_{5}}\]

A. I, II, III 
B. II, III, I
C. II, I, III 
D. I, III, II
Answer» C. II, I, III 


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