Assertion : Generally alkali and alkaline earth metals form
superoxides.
Reason : There is single bond between O and O in superoxides.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Answer

To solve the question, we need to analyze both the assertion and the reason provided.

### Step 1: Analyze the Assertion
The assertion states: "Generally alkali and alkaline earth metals form superoxides."

- Alkali metals (Group 1) can form superoxides, but not all of them do. Specifically, only potassium (K), rubidium (Rb), and cesium (Cs) form superoxides (e.g., KO2, RbO2, CsO2).
- Alkaline earth metals (Group 2) do not typically form superoxides. They primarily form oxides (e.g., MgO, CaO) and peroxides (e.g., BaO2) but not superoxides.

**Conclusion for Assertion**: The assertion is incorrect because it generalizes the behavior of both alkali and alkaline earth metals.

### Step 2: Analyze the Reason
The reason states: "There is a single bond between O and O in superoxides."

- In superoxides, the oxygen-oxygen bond is not a single bond. Instead, superoxides contain the superoxide ion (O2^−), which has a bond order of 1.5 due to the presence of an unpaired electron. This means that the bond between the two oxygen atoms is a three-electron bond, not a single bond.

**Conclusion for Reason**: The reason is also incorrect because it misrepresents the nature of the bond in superoxides.

### Final Conclusion
Since both the assertion and the reason are incorrect, the correct answer to the question is that both statements are false.

### Summary of the Solution
- Assertion: Incorrect (only specific alkali metals form superoxides, not alkaline earth metals).
- Reason: Incorrect (superoxides have a three-electron bond, not a single bond).
- Final Answer: Both assertion and reason are false.