Question

Which of the following oxo-acids of sulphur has maximum number of p$\pi$- d$\pi$ bonds in it?

• A. $H_2{S}_2{O}_2$
• B. $H_2{S}_2{O}_3$
• C. $H_2{S}_2{O}_5$
• D. $H_2{S}_2{O}_8$

Answer 1

The correct option is D $H_2{S}_2{O}_8$

Peroxydisulphuric acid (or Marshall's acid) $H_2{S}_2{O}_8$ has maximum number (four) of p$\pi$- d$\pi$ bonds in it.

$H_2{S}_2{O}_2$ has one p$\pi$- d$\pi$ bond. $H_2{S}_2{O}_3$ and $H_2{S}_2{O}_5$ has two and three p$\pi$- d$\pi$ bonds respectively.