Question

Identify the correct sequence of the increasing number of $\pi$ - bonds in the structures of the 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 1

The correct option is B II <III < I

$H_2{S}_2{O}_6,H-O-\underset{O}{\underset{||}{\stackrel{O}{\stackrel{||}{S}}}}-\underset{O}{\underset{||}{\stackrel{O}{\stackrel{||}{S}}}}-OH4\pi bonds$

$H_{2}S{O}_{3}HO-\stackrel{O}{\stackrel{||}{S}}-OH1\pi bond$

$H_{2}S{O}_{5}H-O-\underset{O}{\underset{||}{\stackrel{O}{\stackrel{||}{S}}}}-\underset{O}{\underset{||}{S}}-O-H3\pi bonds$