When the keto group in 9-fluorenone absorbs light, it releases energy in the visible region because the light's wavelength changes, giving the impression of color. Due to a lack of π-π* bonding electrons, the alcohol group in 9-fluorenone does not absorb light in the visible spectrum and is hence colorless.
Drugs that treat malaria are created using it. With the addition of glacial acetic acid and sodium hypochlorite solution and an oxidation process, it can be made from fluorenol. It is solid at room temperature and has a vivid neon yellow color.
In a semi-rural neighborhood of Portland, Oregon, during a series of four rainstorms in March and April 1982, fluorenone was detected in rainwater at an average concentration of 15 ng/L. (1).
Learn more about fluorenone here
https://brainly.com/question/21603104
#SPJ4