Octane means there are eight carbon atoms in the chain. We can represent this as follows:
\[ \underset{1}{C}-\underset{2}{C}-\underset{3}{C}-\underset{4}{C}-\underset{5}{C}-\underset{6}{C}-\underset{7}{C}-\underset{8}{C} \]
At the third carbon atom, there is an
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