Question

Assertion: The $O - O$ bond length in ${H_2}{O_2}$ is shorter than that of ${O_2}{F_2}$.
Reason: ${H_2}{O_2}$ has an open book-type structure.
Read the above assertion and reason and choose the correct option regarding it.
A.) Assertion is true, Reason is true and Reason is correct explanation for Assertion.
B.) Assertion is true, Reason is true and Reason is NOT the correct explanation for Assertion.
C.) Assertion is true, Reason is false.
D.) Assertion is false, Reason is true.

Answer 1

As both the compounds ${H_2}{O_2}$ and ${O_2}{F_2}$ have similar structure but the hydrogen peroxide that is ${H_2}{O_2}$ is a covalent compound and in ${O_2}{F_2}$ fluorine atoms are highly electronegative.

Complete step by step answer:
In this question, ${H_2}{O_2}$ is known as hydrogen peroxide and ${O_2}{F_2}$ is known as dioxygen difluoride. The hydrogen peroxide contains oxygen-oxygen single bond. Hydrogen peroxide has an open book structure, it is called so because it looks like an open book . It is a non-planar structure. There are two planes in the structure of hydrogen peroxide in which each plane has one $O - H$ bond pair. The open book structure of hydrogen peroxide can be represented as:

The structure of dioxygen difluoride (${O_2}{F_2}$) is also similar to that of hydrogen peroxide that is dioxygen difluoride also have open book like structure but the bond length of oxygen-oxygen bond ($O - O$) is shorter in case of dioxygen difluoride. As we know that Florine is a strongly electronegative element and being a strongest electronegative element, it has tendency to attract electron density towards itself. Therefore, in ${O_2}{F_2}$ Florine attracts the electron density towards itself which results in smaller $O - O$ bond.
As we know that $O - O$ bond length in ${H_2}{O_2}$ is longer as that of in ${O_2}{F_2}$. Therefore, the Assertion is incorrect. Also, the Hydrogen peroxide has an open book structure. Therefore, Reason is true.

Hence, option D is the correct answer.

Note: Remember that in hydrogen peroxide (${H_2}{O_2}$) oxygen also attracts the electron density towards itself but it does not attract to the extent of fluorine in ${O_2}{F_2}$. This is because Florine is more electronegative than oxygen.