Question

select the correct answer.
a scientist discovers a new type of polymer. what must be true about this polymer?

a. it contains carbon atoms arranged in a ring structure.

b. it has double bonds between all the carbon atoms.

c. it contains molecules of many different types.

d. it is made of large molecules with repeating units.

Explanation:

To solve this, we analyze each option:

• Option A: Not all polymers have carbon in a ring structure (e.g., polyethylene has linear carbon chains), so A is false.
• Option B: Polymers can have single bonds (e.g., polyethylene has single C - C bonds), so B is false.
• Option C: Polymers are made of repeating units (monomers), so they have the same or similar molecular units, not many different types. Thus, C is false.
• Option D: By definition, a polymer is a large molecule (macromolecule) made of repeating structural units (monomers). So D is correct.

Answer:

D. It is made of large molecules with repeating units.