The Lassaigne test is used for the detection of which of the following elements?

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

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

An organic compound $A$ is oxidized with $Na_2O_2$ followed by boiling with $HNO_3$. The resultant solution is then treated with ammonium molybdate to yield a yellow precipitate. Based on the above observation,the element present in the given compound is:

Lassaigne’s test is used to detect which of the following elements in an organic compound?

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