Interhalogen Compounds
Which interhalogen compound does not exist?
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About This Question
- Subject
- chemistry
- Chapter
- p-block elements
- Topic
- interhalogen compounds
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
FCl₃
Interhalogen compounds (XXn′) follow specific stability rules:
- The central atom (X) must be the larger, less electronegative halogen.
- The central atom must be able to expand its octet using d-orbitals to accommodate multiple bonds.
- FCl3 Fail: Here, Fluorine would be the central atom. But Fluorine is the most electronegative element (cannot be X) and lacks d-orbitals, so it cannot form more than one covalent bond. Thus, FCl3 cannot exist, while ClF3 is perfectly stable.
This medium difficulty chemistry question is from the chapter p-block elements, covering the topic of interhalogen compounds. It appeared in the 2025 exam.
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