Which halogen can be detected using the "water test," where the organic compound is shaken with water, and the aqueous layer is tested for the halogen?

Which reagent is commonly used to detect the presence of halogens (chlorine, bromine, iodine) in organic compounds?

What is the principle behind the Beilstein test for detecting halogens in organic compounds?

Which apparatus is commonly used for the detection of halogens in organic compounds?

After adding silver nitrate to an organic compound and observing a yellow precipitate, which test can be performed to distinguish between chlorine and bromine?