A clean copper wire is dipped in an organic compound and held in the non-luminous Bunsen flame. A green or blue-green flame indicates the presence of

Anitrogen
Bsulphur
Cphosphorus
Da halogen

Answer: D

In the Beilstein test the compound forms a volatile copper(II) halide on the hot copper oxide, which imparts a green or blue-green colour to the flame. It indicates a halogen, though not which one.

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