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# The CORRECT order of first ionisation enthalpy is:

Question:

The CORRECT order of first ionisation enthalpy is:

1. $\mathrm{Mg}<\mathrm{S}<\mathrm{Al}<\mathrm{P}$

2. $\mathrm{Mg}<\mathrm{Al}<\mathrm{S}<\mathrm{P}$

3. $\mathrm{Al}<\mathrm{Mg}<\mathrm{S}<\mathrm{P}$

4. $\mathrm{Mg}<\mathrm{Al}<\mathrm{P}<\mathrm{S}$

Correct Option: 3,

Solution:

$\mathrm{Mg} \mathrm{Al} \quad \mathrm{P} \quad \mathrm{S} \rightarrow \mathrm{IE}$. order $\Rightarrow \mathrm{Al}<\mathrm{Mg}<\mathrm{S}<\mathrm{P}$