Which of the following pairs is $NOT$ correctly matched?

If a polythene sample contains two monodisperse fractions in the ratio $2:3$ with degree of polymerization $100$ and $200$,respectively,then its weight average molecular weight will be

Which of the following statements about low density polythene is $FALSE$?

The monomeric unit of Orlon is $...$.

Neoprene is the polymer of a monomer $X$. The $IUPAC$ name of $X$ is

Which among the following polymers restores its original shape once stretched?