Which of the following is not the point of difference between Be and other alkline earth metals?

Options

A. It has a tendency to form covalent bonds.
B. It dissolves in alkalies with evolution of hydrogen
C. Its oxides and hydroxides are amphoteric.
D. its carbide gives acetylene on hydrolysis.

Explanation

To determine which of the following is not a point of difference between Beryllium (Be) and other alkaline earth metals, we need to analyze the properties and reactions of Beryllium compared to the other elements in the group.

### Step-by-Step Solution:

1. **Identify the Properties of Beryllium:**
- Beryllium is unique among the alkaline earth metals due to its small size, high ionization energy, and high electronegativity.
- It forms covalent compounds, unlike other alkaline earth metals which typically form ionic compounds.

2. **Examine Beryllium Carbide (Be2C):**
- Beryllium carbide (Be2C) is known to produce methane (CH4) when it reacts with water.
- The reaction can be represented as:
\[ \text{Be}_2\text{C} + 4\text{H}_2\text{O} \rightarrow 2\text{Be(OH)}_2 + \text{CH}_4 \]

3. **Compare with Other Alkaline Earth Metal Carbides:**
- Other alkaline earth metal carbides typically yield acetylene (C2H2) upon hydrolysis.
- For example, calcium carbide (CaC2) reacts with water to produce acetylene:
\[ \text{CaC}_2 + 2\text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2 + \text{C}_2\text{H}_2 \]

4. **Identify the Point of Difference:**
- The key point of difference here is that Beryllium carbide produces methane while the carbides of other alkaline earth metals produce acetylene.
- Therefore, the statement that "its carbide gives acetylene on hydrolysis" is incorrect for Beryllium and is not a point of difference.

5. **Conclusion:**
- The correct answer to the question is that the statement about Beryllium carbide giving acetylene on hydrolysis is not a point of difference between Beryllium and other alkaline earth metals.

### Final Answer:
The option that is not a point of difference between Beryllium and other alkaline earth metals is: "its carbide gives acetylene on hydrolysis."