Which of the following is a completely fluorinated polymer?

Which of the following is $NOT$ true for polymers?

The polymer chains are held together by hydrogen bonding in a polymer $X$. Polymer $X$ is formed from monomers $Y$ and $Z$. What are $Y$ and $Z$ ?

$CH_2=CH-C_6H_5$	$H_2N(CH_2)_6NH_2$	$CH_2=CH-CH=CH_2$	$CH_2=CH-CN$	$HO_2C(CH_2)_4CO_2H$
$A$	$B$	$C$	$D$	$E$

Nylon $6, 6$ is:

$A$ polymer containing nitrogen is

If $\bar{M}_w$ is the weight average molecular weight and $\bar{M}_n$ is the number average molecular weight of a polymer, the poly dispersity index $(PDI)$ of the polymer is given by