Saturated hydrocarbons are organic compounds that contain only single bonds between the carbon atoms. They are known to be the simplest organic compounds. They are termed as such because they are saturated with water. Examples are the alkanes (ethane, methane, propane, butane, etc.).
The symbol for the hydroxide ion is OH-
The frequency will decrease because the waves are getting farther and farther apart and if they and as that happens with shorter and shorter so they decrease