A phenyl group is a functional group derived from benzene, consisting of a six-carbon ring with alternating double bonds. It is represented by the symbol C6H5 and is formed when one hydrogen atom from benzene is replaced by another atom or group. The phenyl group is commonly found in various organic compounds, influencing their chemical properties and reactivity. In organic chemistry, the presence of a phenyl group can significantly affect the behavior of molecules. It often contributes to the stability and aromaticity of compounds, making them more resistant to certain chemical reactions. Phenyl groups are prevalent in many natural and synthetic substances, including pharmaceuticals and dyes.