Question

How many of the following compounds have peroxide linkage?
${{H}_{3}}P{{O}_{5}},\text{ }{{H}_{2}}S{{O}_{5}},\text{ }{{H}_{2}}{{S}_{2}}{{O}_{8}},\text{ }HN{{O}_{4}},\text{ }{{H}_{4}}{{P}_{2}}{{O}_{7}},\text{ }{{H}_{2}}{{S}_{2}}{{O}_{3}},\text{ }{{H}_{2}}{{S}_{2}}{{O}_{6}}$
A. 4
B. 5
C. 6
D. None of these

Answer 1

If there is a chemical bond between two oxygen atoms in a molecule then the chemical bond is called peroxide bond. The peroxide bonds are very less stable in the presence of sunlight and we have to keep them away from the sunlight.

Complete answer:
- In the question it is given how many of the given compounds contain peroxide bonds.
- We have to find the number of compounds that have peroxide bonds in their structures.
- The structure of ${{H}_{3}}P{{O}_{5}}$ is as follows.

- ${{H}_{3}}P{{O}_{5}}$ has one peroxide bond in its structure.
- The structure of ${{H}_{2}}S{{O}_{5}}$ is as follows.

- ${{H}_{2}}S{{O}_{5}}$ has one peroxide bond in its structure.
- The structure of ${{H}_{2}}{{S}_{2}}{{O}_{8}}$ is as follows.

- ${{H}_{2}}{{S}_{2}}{{O}_{8}}$ has one peroxide bond in its structure.
- The structure of $HN{{O}_{4}}$ is as follows.

- $HN{{O}_{4}}$ has one peroxide bond in its structure.
- The structure of ${{H}_{4}}{{P}_{2}}{{O}_{7}}$ is as follows.

- There is no peroxide bond in ${{H}_{4}}{{P}_{2}}{{O}_{7}}$ .
- The structure of ${{H}_{2}}{{S}_{2}}{{O}_{3}}$ is as follows.

- There is no peroxide bond in ${{H}_{2}}{{S}_{2}}{{O}_{3}}$
- The structure of ${{H}_{2}}{{S}_{2}}{{O}_{6}}$ is as follows.

- There is no peroxide bond in ${{H}_{2}}{{S}_{2}}{{O}_{6}}$
- Out of the given seven compounds only four compounds have peroxide bonds in their structure.

So, the correct option is A.

Note:
Without drawing or knowing the structure of the compounds we cannot say whether the compound contains a peroxide bond or not. The structure of the molecules or compounds reveals the presence of the peroxide bond.