You have been provided with the polymer solution described in Figure $4\mathrm{.}1$:

$\frac{?}{\text{b}\text{a}\text{r}}(M{)}_w=105,000\frac{g}{m}$ole

Dissolved in tetrahydrofuran at

an unknown concentration

Figure $4\mathrm{.}1$: The figure shows the chemical structure of the polymer and its properties.

Using the polymer solution as is $($no changes can be made to the solution$),$ you were asked

to determine whether you can confirm its molecular weight using each of the $4$ techniques

available in your lab:

a$)$ Gel permeation chromatography having tetrahydrofuran as the mobile phase

b$)$ Matrix$-$assisted laser desorption$/$ionization

c$)$ Dynamic light scattering

d$)$ Membrane osmometry

Your answer should have the following format:

a$)$ GPC can be used because $$ or GPC can not be used because $x$

b$)$ MALDI can be used because $$ or MALDI can not be used because $x$

c$)$ DLS can be used because xxxxxxxx or DLS can not be used because $x$

d$)$ Membrane osmometry can be used because xxxxxxxx or Membrane osmometry can not be

used because xxxxxxx

Limit your answer for each technique to two lines maximum.