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  4. Lassaigne’s test (with silver nitrate) is commonly used to detect halogens such as chlorine, bromine and iodine but not useful to detect fluorin because the product AgF formed is

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Q. Lassaigne’s test (with silver nitrate) is commonly used to detect halogens such as chlorine, bromine and iodine but not useful to detect fluorin because the product $AgF$ formed is

KEAMKEAM 2017Organic Chemistry – Some Basic Principles and Techniques

Solution:

As $AgF$ is soluble in Lassaighe's solution (silver nitrate solution), it will not give any precipitate.