The incorrect statement is:

Options

A. The second ionisation energy of Se is greater than that of second ionisation energy of As
B. The first ionisation energy of `C^(2+)` ion is greater than the first ionization energy of `N^(2+)` ion
C. The third ionisation energy of F is greater than the third ionisation energy of O
D. Halogens have highest I.E. in respective period

Answer

D

Explanation

(d) In respective period, noble gases have highest I.E.