Sum of $$\pi$$-bonds present in peroxodisulphuric acid and pyrosulphuric acid is

Explanation

To determine the total number of $$\pi$$-bonds, first draw the structures of the given oxoacids of sulphur.

Each $$S=O$$ double bond contains one $$\pi$$-bond.

Therefore, the total number of $$\pi$$-bonds is equal to the total number of $$S=O$$ double bonds present in the molecules.

For peroxodisulphuric acid, $$H_2S_2O_8$$

The structure contains:

• One $$S-O-O-S$$ peroxide linkage
• Two $$S-OH$$ bonds
• Four $$S=O$$ double bonds

Hence, the number of $$\pi$$-bonds in $$H_2S_2O_8$$ is

$$4$$

For pyrosulphuric acid, $$H_2S_2O_7$$

The structure contains:

• One $$S-O-S$$ bridge
• Two $$S-OH$$ bonds
• Four $$S=O$$ double bonds

Hence, the number of $$\pi$$-bonds in $$H_2S_2O_7$$ is

$$4$$

Therefore, the total number of $$\pi$$-bonds present in both molecules is

$$4+4=8$$

Hence, the correct answer is

$$8$$