Which of the following is not correctly matched with the given example ?

Options

A. An element of first transition series which has highest second ionisation enthalpy - Cu.
B. An element of first transition series with lowest third ionisation enthalpy - Zn.
C. An element of first transition series with lowest enthylpy of atomisation - Zn.
D. An element of first transition series with lowest enthalpy -Zn.

Explanation

To solve the question "Which of the following is not correctly matched with the given example?", we need to analyze the statements provided in the options and verify their correctness based on the properties of the elements in the first transition series.

### Step-by-Step Solution:

1. **Understanding Ionization Enthalpy**:
- Ionization enthalpy refers to the energy required to remove an electron from an atom in the gaseous state. The second ionization enthalpy is the energy required to remove a second electron after the first has been removed.

2. **Analyzing the First Statement**:
- The first statement claims that "an element of the first transition series which has the highest second ionization enthalpy is copper."
- Copper has the electronic configuration of [Ar] 3d10 4s1. When it loses one electron (first ionization), it becomes Cu⁺ with the configuration [Ar] 3d10. The second ionization involves removing an electron from the stable 3d10 configuration, which requires a significant amount of energy. Thus, this statement is **correct**.

3. **Analyzing the Second Statement**:
- The second statement claims that "an element of the first transition series has the lowest third ionization enthalpy for zinc."
- Zinc has the electronic configuration of [Ar] 3d10 4s2. The first two ionizations remove electrons from the 4s orbital, but the third ionization requires removing an electron from the stable 3d10 configuration. This third ionization enthalpy is actually very high, not low, because removing an electron from a fully filled d-subshell is energetically unfavorable. Therefore, this statement is **incorrect**.

4. **Analyzing the Third Statement**:
- The third statement claims that "an element of the first transition series with the lowest enthalpy of atomization is zinc."
- Zinc has a completely filled d-subshell (3d10) and s-subshell (4s2), which results in fewer unpaired electrons. Lower unpaired electrons correlate with lower enthalpy of atomization. Hence, this statement is **correct**.

5. **Conclusion**:
- The only statement that is not correctly matched with the given example is the second statement about zinc having the lowest third ionization enthalpy. It should state that zinc has the highest third ionization enthalpy due to the stability of the 3d10 configuration.

### Final Answer:
The option that is not correctly matched is the second statement regarding zinc.

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