JEE MAIN - Chemistry (2025 - 2nd April Morning Shift - No. 19)
The property/properties that show irregularity in first four elements of group-17 is/are
(A) Covalent radius
(B) Electron affinity
(C) Ionic radius
(D) First ionization energy
Choose the correct answer from the options given below :
A, B, C and D
A and C only
B only
B and D only
Explanation
The order of first four elements of group-17 are as follows.
$$\mathrm{F}<\mathrm{Cl}<\mathrm{Br}<\mathrm{I} \text { (Covalent radius) }$$
$\mathrm{Cl}>\mathrm{F}>\mathrm{Br}>\mathrm{I}$ (Electron affinity)
$\mathrm{F}<\mathrm{Cl}^{-}<\mathrm{Br}^{-}<\mathrm{I}$ (Ionic radius)
$\mathrm{F}>\mathrm{Cl}>\mathrm{Br}>\mathrm{I}$ ( $\mathrm{I}^{\mathrm{st}}$ ionization energy)
Electron affinity order is irregular.
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