Question

Identify the correct sequence of the increasing order of $\pi$- bonds in 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

Therefore, number of $\pi$ bonds in increasing order is:
$H_{2}S{O}_3$ (II) < $H_2{S}_2{O}_5$ (III) < $H_2{S}_2{O}_6$ (I)