Element which does not reach with `NaOH`.
`(i)Mg" (ii) Be (iii) Al (iv) Zn"`

Options

A. 1,3
B. 1,2,3
C. 1,4
D. 1,3,5

Answer

To determine which element does not react with sodium hydroxide (NaOH), we need to analyze the behavior of the given elements: Magnesium (Mg), Beryllium (Be), Aluminum (Al), and Zinc (Zn) when they come into contact with NaOH.

### Step-by-Step Solution:

1. **Understanding the Reactivity with NaOH**:
- Sodium hydroxide is a strong base and can react with certain metals to form metal hydroxides and hydrogen gas.
- However, not all metals react with NaOH due to the presence of a protective oxide layer or other reasons.

2. **Analyzing Each Element**:
- **Magnesium (Mg)**:
- Magnesium can react with NaOH, but it typically does not react in the presence of a protective oxide layer. Thus, it is often considered unreactive under certain conditions.
- **Beryllium (Be)**:
- Beryllium does not react with NaOH because it forms a stable oxide layer that protects it from further reaction.
- **Aluminum (Al)**:
- Similar to magnesium and beryllium, aluminum also forms a protective oxide layer, which prevents it from reacting with NaOH under normal conditions.
- **Zinc (Zn)**:
- Zinc reacts with NaOH to form sodium zincate (Na2ZnO2) and hydrogen gas. Therefore, zinc does react with NaOH.

3. **Conclusion**:
- The elements that do not react with NaOH are Magnesium (Mg) and Aluminum (Al) due to their oxide layers.
- Therefore, the correct answer is (i) Mg and (iii) Al.

### Final Answer:
The elements which do not react with NaOH are **(i) Mg and (iii) Al**.

---