$13.$ What is the primary use of aromatics in the petrochemical industry?

a$)$ Production of textiles

b$)$ Manufacturing of fertilizers

c$)$ Production of plastics

d$)$ None of the above

$14.$ Which of the following is NOT a product of petrochemical processes?

a$)$ Ethanol

b$)$ Polyethylene

c$)$ Ammonia

d$)$ Styrene

$15.$ What is the main function of synthesis gas in petrochemical processes?

a$)$ Providing heat for reactions

b$)$ Serving as a catalyst

c$)$ Acting as a precursor for various chemicals

d$)$ None of the above

$16.$ Which of the following is a primary use of hydrogen in the petrochemical industry?

a$)$ Fuel for automobiles

b$)$ Production of ammonia

c$)$ Manufacturing of glass

d$)$ None of the above