What is the correct order of successive ionization enthalpies?

I E_{I I I} > I E_{I I} > I E_{I}

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I E_{I} > I E_{I I} > I E_{I I I}

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I E_{I I} > I E_{I} > I E_{I I I}

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I E_{I I I} > I E_{I} > I E_{I I}

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Solution

The correct option is B $I E_{I I I} > I E_{I I} > I E_{I}$
The ionization energy of a multivalent atom increases with a consecutive removal of an electron. This is due to an increase in effective nuclear charge on the valence electron that makes it difficult to ionize a cation.
Therefore $I E_{1} < I E_{2} < I E_{3}$ and so on
option A

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