Which test is useful for the detection of halogens in organic compounds?

Which of the following compounds would give the following set of qualitative analysis?
$(i)$ Fehling's Test : Positive
$(ii)$ $Na$ fusion extract upon treatment with sodium nitroprusside gives a blood red colour.

The violet color obtained in the Lassaigne's test for a sulfur-containing compound is due to the formation of which species?

Which test is used to detect the presence of halogens in an organic compound?

When the Lassaigne's extract of a sulfur-containing compound is treated with sodium nitroprusside,what color is obtained?

Which of the products indicates the presence of sulphur atom in an organic compound,in qualitative elemental analysis?