$33.$ Which of the following processes is used in the production of acetylene?

a$)$ Steam cracking

b$)$ Catalytic reforming

c$)$ Pyrolysis of hydrocarbons

d$)$ Fischer$-$Tropsch synthesis

$34.$ What is the primary use of propylene in the petrochemical industry?

a$)$ Production of solvents

b$)$ Manufacturing of detergents

c$)$ Fuel for heavy machinery

d$)$ None of the above

$35.$ Which of the following is a common petrochemical product derived from naphthenes?

a$)$ Diesel

b$)$ Gasoline

c$)$ Ethanol

d$)$ Natural gas

$36.$ What is the main function of synthesis gas in the production of methanol?

a$)$ Acting as a catalyst

b$)$ Providing heat for reactions

c$)$ Serving as a precursor for various chemicals

d$)$ None of the above