$61.$ The production of $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ involves the catalytic cracking of hydrocarbons to yield $\_\_\_\_\_\_\_\_\_\_\_\_\_,$ which are then further processed to produce various $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.($a$)$ Propylene, butenes, polymers $($b$)$ Butadiene, ethylene, solvents $($c$)$ Acetylene, aromatics, fuels $($d$)$ Ethanol, butylene, detergents

$62.\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ is a common feedstock used in the production of synthesis gas through $\_\_\_\_\_\_\_\_\_\_\_\_\_,$ a process that involves the reaction of methane with steam or oxygen to produce $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_.($a$)$ Natural gas, steam reforming, hydrogen $($b$)$ Coal, partial oxidation, carbon monoxide $($c$)$ Crude oil, hydrocracking, propylene $($d$)$ Biomass, pyrolysis, synthesis gas

$63.$ The primary function of $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ in petrochemical processes is to serve as a precursor for the production of various $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_,$ which are then used in the manufacturing of plastics, fibers, and coatings. $($a$)$ Ethylene, polymers $($b$)$ Butadiene, solvents $($c$)$ Acetylene, resins $($d$)$ Methanol, fertilizers

$64.\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ and $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$ are common petrochemical derivatives used in the production of pharmaceuticals, cosmetics$,$ and detergents, among other applications. $($a$)$ Ethanol, methanol $($b$)$ Ethylene glycol, propylene glycol $($c$)$ Butylene oxide, ethylene oxide $($d$)$ Butadiene, styrene