$57.\_\_\_$ is a common petrochemical product derived from naphthenes, commonly used as a fuel for automobiles and $\_\_\_.($a$)$ Diesel $($b$)$ Gasoline $($c$)$ Jet fuel $($d$)$ Propane

$58.$ The main application of $\_\_\_$ in the petrochemical industry is the production of ammonia for fertilizers and $\_\_\_.($a$)$ Synthesis gas $($b$)$ Hydrogen $($c$)$ Butylene $($d$)$ Ethylene