Which of the following is the most reactive among the halogens? (UPSC Prelims 1997)

Q. Which of the following is the most reactive among the halogens? (UPSC Prelims 1997)
Answer: fluorine
Notes: The bonds in these diatomic molecules are non-polar covalent single bonds. However, halogens readily combine with most elements and are never seen uncombined in nature. As a general rule, fluorine is the most reactive halogen and astatine is the least reactive.

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