<i>Longer chains still get you heavy fuel oils, tars, etc.</i><p>...and eventually that results in simple plastics like polyethylene, which is basically a <i>very</i> long chain hydrocarbon:<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Polyethylene" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Polyethylene</a>