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Q.

Positive Beilstein test for halogen shows that

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a

a halogen is absent

b

a halogen is definitely present

c

none of these

d

a halogen may be present

answer is B.

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Detailed Solution

A positive Beilstein's test for halogens does not always indicate the presence of halogen since some halogen free compounds viz. urea, thiourea, amides etc. also respond this test. The reason being the fact that these halogen free compounds form cuprous cyanide which is volatile and
decomposes to copper which burns with green flame.

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Positive Beilstein test for halogen shows that