Which chromatography mode is used to determine the molecular mass of polymer substances?

Which polymer among the following does $NOT$ contain ester linkage in it?

Which of the following polymers is used to prepare shoe soles?

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A:$ Dacron is an example of polyester polymer.
Reason $R:$ Dacron is made up of ethylene glycol and terephthalic acid monomers.
In the light of the above statements,choose the most appropriate answer from the options given below.

Which of the following is not a polyamide?

Which of the following statements is incorrect?