which of the following contains peroxy linkage?

$\begin{array}{l}{\mathrm{H}}_4{\mathrm{P}}_2{\mathrm{O}}_8,{\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8,{\mathrm{H}}_2{\mathrm{SO}}_5,{\mathrm{H}}_3{\mathrm{PO}}_5,{\mathrm{HNO}}_4,{\mathrm{HClO}}_4,\\ {\mathrm{HIO}}_4,{\mathrm{HClO}}_3\end{array}$

A peroxy linkage is a characteristic feature found in certain chemical compounds. It is defined as the presence of two oxygen atoms bonded to each other by a single bond, which can be represented as −O−O−. This unique linkage plays a significant role in the chemical and reactive properties of these substances.

Among the compounds listed in the question, it is essential to identify those containing the peroxy linkage. Let's analyze the given options systematically:

• H₄P₂O₈ (h4p2o8): This compound contains a peroxy linkage. It has a structural arrangement where two oxygen atoms are connected by a single bond, qualifying it as a compound with peroxy linkage.
• H₂S₂O₈: This is another example of a compound with a peroxy linkage. Its structure includes the characteristic −O−O− bond.
• H₂SO₅: Known as peroxomonosulfuric acid, this compound also exhibits a peroxy linkage.
• Other compounds such as H₃PO₅, HNO₄, HClO₄, HIO₄, and HClO₃ do not contain the peroxy linkage as their structures lack the −O−O− bond.

The compound h4p2o8, also known as peroxydiphosphoric acid, stands out due to its inclusion of the −O−O− bond. This peroxy linkage contributes to its reactivity and distinct chemical behavior. Similarly, H₂S₂O₈ (peroxodisulfuric acid) and H₂SO₅ are notable examples of compounds with this unique bond.

In summary, a peroxy linkage is identified by the −O−O− bond, and compounds like h4p2o8 are key examples. Understanding the presence of this linkage helps in analyzing the reactivity and properties of these substances effectively.