Beilstein test : This test was used to identify halogens. The copper oxide on the wire reacts with the organic halide to produce a copper-halide compound that gives a blue-green color to the flame.A positive result is a green flame, although it might be short-lived and faint chlorides, iodides, and other halogens gave positive response to test but only fluorides were not responded to the test.

Why this happened?

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