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NEET Chemistry QUESTION #7390
Question 1
For the electron affinity (EA) of halogens, which order is correct?
  • \(\text{Br} > \text{F}\)
  • \(\text{F} > \text{Cl}\)
  • \(\text{Br} > \text{Cl}\)
  • \(\text{F} > \text{I}\)✔️
Correct Answer Explanation
Electron affinity trend in halogens:
Expected trend: EA increases up the group (smaller atom = stronger attraction for incoming electron). However, F is an exception — its very small size causes high electron–electron repulsion in the compact 2p subshell, reducing its EA.

Actual order: Cl > F > Br > I

\(\text{F} > \text{I}\) is correct ✓. The correct option here is (4): F > I.