$59.\_\_\_$ and $\_\_\_$ are common methods used in the refining process to remove impurities such as sulfur and nitrogen from feedstock. $($a$)$ Absorption $($b$)$ Cracking $($c$)$ Desalting $($d$)$ Polymerization

$58.\_\_\_$ and $\_\_\_$ are common petrochemical products derived from naphthenes, commonly used as fuels for various purposes. $($a$)$ Gasoline, diesel $($b$)$ Propane, butane $($c$)$ Methane, ethane $($d$)$ Jet fuel, kerosene