Which of the following has highest first ionization enthalpy?

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Solution

The correct option is C
C

The first ionization enthalpy of group 14 elements are higher than the corresponding group 13 elements. This is due to smaller size of atoms and hence greater effective nuclear charge of group 14 elements as compared to group 13 elements.
Therefore, Carbon has highest first ionization energy.
$C > B > S i > A l$

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