List the functional groups in this polymer: -CO(CH2)4CONHC(CH3)2CH2O-

The C on the left has four bonds - one to the (CH2)4 group, two to the O in the C=O, where does the bond dangling off the left hand of the polymer go to?

What kind of bond it that?

The section of polymer you gave us is itself made of two individual monomers. Can you identify those?

Perhaps I should have been clearer.

The section of polymer is made up of two different monomers which have bonded together to make the repeat unit you gave us.

Can you identify (name) the two monomers?

Hexanedioic acid and 2-amino-2-methylpropanol.

The amide linkage is shown in the middle, the ester is split.

Perhaps two repeat units would show it more clearly:

-CO(CH2)4CONHC(CH3)2CH2OCO(CH2)4CONHC(CH3)2CH2O-

CH2OCO(
is right there in the middle

CH2 - O - C=O - (CH2)4

thank you, missed that.

I now understand.

Can I jjust ask you, how did you know to draw out the two monomers??

It isn't a thing to 'know'.

It was just a train of conversation to try to get you to recognise what was there: a di-acid and an amino-alcohol, hence why you'd get amide and an ester linkages.

The best thing to do in these situations is to draw out the full displayed formula, ensuring that each C has four bonds.

Maybe this interactive on polyester formation will help ...