$9.$ Acetylene is commonly used in the production of:

A$)$ Glass

B$)$ Pharmaceuticals

C$)$ Plastics

D$)$ Fertilizers

$10.$ Which of the following is a building block for synthetic rubber?

A$)$ Butylene

B$)$ Aromatics

C$)$ Naphthenes

D$)$ Propylene

$11.$ Which petrochemical derivative is commonly found in cleaning agents and detergents?

A$)$ Ethylene glycol

B$)$ Propylene oxide

C$)$ Butyl rubber

D$)$ Aromatics

$12.$ What is the primary use of aromatics in the petrochemical industry?

A$)$ Fuel additives

B$)$ Solvents and chemicals

C$)$ Lubricants

D$)$ Fertilizers