Identify the polymer used to prepare plastic bottles needed to store cooking oil.

Step-by-step solution

Polyethylene terephthalate (PET) is a strong, lightweight, and transparent synthetic resin belonging to the polyester family of polymers. It provides an excellent barrier to oxygen and moisture, making it highly suitable for food packaging. PET is widely blow-moulded into disposable plastic bottles used for storing cooking oil, mineral water, and carbonated beverages. Answer: PET