What is a very long molecule that has chemicals in a special order?

It will be a polymer

A polymer is a macromolecule which is obtained by repetitive combination of small molecules known as monomers.

When these monomers are combined in repetitive manner they form a long chain of small monomers or a very long molecule

Now in case of polymer also there is formation of bond between monomers which is possible only if they combine in a definite or special order.

Now here the answer can be very specific like

a) bio polymer : example : DNA , RNA , Protein, starch, cellulose

b) synthetic polymer: polyethylene, PVC

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