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  4. PDI for natural polymers is generally close to

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Q. $PDI$ for natural polymers is generally close to

Polymers

Solution:

$PDI$ abbreviates as polydispersity index of polymer.
$PDI =\frac{\overline{M_{w}}}{\overline{M_{n}}}$
For natural polymers $PDI = 1$, i.e.,$\overline{M_{w}} = \overline{M}_{n}$
For synthetic polymers $PDI >1$, i.e., $\overline{M_{w}} > \overline{M}_{n}$