Which of the following represent the correct order of electron affinities?

Options

A. FgtClgtBrgtI
B. CltNltClltF
C. NltCltOltF
D. CltSigtPgtN

Answer

C,D

Explanation

Generally the electron affinity values of `3^(rd)` period elements are higher than the elements of 2nd period of the same group because of less interelectronic repulsions.Atomic size, nuclear charge and electrons configuration also affect the electron affinity.
Electron gain enthalpes in KJ `mol^(-1)` are:
`C=-121,Si=-134,P=-74,N~~O,O=-142,F=-328`