Question

Which of the following compound have $\text{X}-\text{O}-\text{X}$ linkage where ‘$\text{X}$’ is the so called central atom like $\text{P}$, $\text{S}$ etc?
(A) ${\text{P}}_{\text{2}}{\text{O}}_8^{4-}$
(B) ${\text{S}}_{\text{2}}{\text{O}}_3^{2-}$
(C) $\gamma -\text{S}{\text{O}}_3$
(D) ${\text{S}}_{\text{2}}{\text{O}}_5^{2-}$

Answer 1

Hint: To solve this we must first draw the structures of all the four given compounds. From the structures we can determine the compound having $\text{X}-\text{O}-\text{X}$ linkage. First of all we should draw the exact structure of the compound to find out the central atom.

Complete Step by step answer: ${\text{P}}_{\text{2}}{\text{O}}_8^{4-}$ is known as peroxydisulfate ion. Draw the structure of ${\text{P}}_{\text{2}}{\text{O}}_8^{4-}$:

In the structure of ${\text{P}}_{\text{2}}{\text{O}}_8^{4-}$, we cannot see $\text{P}-\text{O}-\text{P}$ linkage. Thus, ${\text{P}}_{\text{2}}{\text{O}}_8^{4-}$ does not have $\text{X}-\text{O}-\text{X}$ linkage.
Thus, option (A) is not correct.
${\text{S}}_{\text{2}}{\text{O}}_3^{2-}$ is known as thiosulphate ion. Draw the structure of ${\text{S}}_{\text{2}}{\text{O}}_3^{2-}$:

In the structure of ${\text{S}}_{\text{2}}{\text{O}}_3^{2-}$, we cannot see $\text{S}-\text{O}-\text{S}$ linkage. Thus, ${\text{S}}_{\text{2}}{\text{O}}_3^{2-}$ does not have $\text{X}-\text{O}-\text{X}$ linkage.
Thus, option (B) is not correct.
$\gamma -\text{S}{\text{O}}_3$ is known as sulphur trioxide. Draw the structure of $\gamma -\text{S}{\text{O}}_3$:

In the structure of $\gamma -\text{S}{\text{O}}_3$, we can see $\text{S}-\text{O}-\text{S}$ linkage. The $\text{S}-\text{O}-\text{S}$ is shown in red colour. Thus, $\gamma -\text{S}{\text{O}}_3$ has $\text{X}-\text{O}-\text{X}$ linkage.
Thus, option (C) is correct.
${\text{S}}_{\text{2}}{\text{O}}_5^{2-}$ is known as metabisulphite. Draw the structure of ${\text{S}}_{\text{2}}{\text{O}}_5^{2-}$:

In the structure of ${\text{S}}_{\text{2}}{\text{O}}_5^{2-}$, we cannot see $\text{S}-\text{O}-\text{S}$ linkage. Thus, ${\text{S}}_{\text{2}}{\text{O}}_5^{2-}$ does not have $\text{X}-\text{O}-\text{X}$ linkage.
Thus, option (D) is not correct.
Thus, the compound have $\text{X}-\text{O}-\text{X}$ linkage where ‘$\text{X}$’ is the so called central atom like $\text{P}$, $\text{S}$ etc is $\gamma -\text{S}{\text{O}}_3$.

Thus, the correct option is (C) $\gamma -\text{S}{\text{O}}_3$.

Note: Sulphur trioxide $\left(\text{S}{\text{O}}_3\right)$ has many structural changes and thus, it has many different forms. These changes are caused by the traces of water. $\gamma -\text{S}{\text{O}}_3$ is very pure gaseous sulphur trioxide. It is a trimeric structure i.e. it has three molecules of sulphur trioxide. $\gamma -\text{S}{\text{O}}_3$ forms a cyclic structure. It is colourless solid in appearance. Sulphur trioxide is highly hygroscopic in nature i.e. it can easily attract water molecules from its surroundings by absorption or adsorption.