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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3si195

Which statements about the Beilstein test are correct?

  1. AThe colour of the flame identifies the halogen as Cl, Br or I.
  2. BChlorobenzene gives a green or blue-green flame.
  3. CThe colour is due to a volatile copper(II) halide formed on the hot copper wire.
  4. DA compound free of halogens, such as ethanol, gives no green flame.

Answer: B, C, D

The test shows only that a halogen is present: the flame colour does not tell Cl, Br and I apart, so (A) is wrong. Chlorobenzene forms volatile cupric chloride on the wire and gives the green-blue flame (B, C). Ethanol has no halogen and gives no green flame (D).
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