Assertion : Hydrogen resembles both, alkali metals as well as halogens.
Reason : Hydrogen forms oxides, halides and sulphides, and exists as diatomic molecule.

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

### Step-by-Step Solution

1. **Understanding the Assertion**: The assertion states that hydrogen resembles both alkali metals and halogens. To evaluate this, we need to analyze the properties of hydrogen in comparison to these two groups.

2. **Hydrogen and Alkali Metals**:
- Alkali metals (like sodium and potassium) have one electron in their outermost shell and tend to lose this electron to form positive ions (cations).
- Hydrogen also has one electron in its outer shell. When it loses this electron, it forms a positive ion (H⁺), similar to alkali metals.
- Example: In the formation of water (H₂O), hydrogen loses its electron to form H⁺, which combines with OH⁻ to create H₂O.

3. **Hydrogen and Halogens**:
- Halogens (like chlorine and fluorine) have seven electrons in their outer shell and tend to gain one electron to form negative ions (anions).
- Hydrogen can also form compounds with halogens. When hydrogen reacts with chlorine, it forms hydrochloric acid (HCl) by losing an electron to become H⁺, which combines with Cl⁻.
- Example: H⁺ + Cl⁻ → HCl.

4. **Formation of Sulfides**:
- Hydrogen can also form sulfides. When hydrogen reacts with sulfide ions (H₂⁻), it forms hydrogen sulfide (H₂S).
- Example: H⁺ + H₂⁻ → H₂S.

5. **Understanding the Reason**: The reason states that hydrogen forms oxides, halides, and sulfides, and exists as a diatomic molecule (H₂).
- This is true since hydrogen does indeed form these compounds and exists as H₂ in its molecular form.

6. **Conclusion**:
- Both the assertion and the reason are true statements. However, the reason provided does not serve as the correct explanation for the assertion. The correct explanation is that hydrogen resembles alkali metals because it can lose its single outer electron to form H⁺ ions, similar to how alkali metals behave.

7. **Final Answer**: The correct option is that both the assertion and reason are true, but the reason is not the correct explanation for the assertion.