When \( n \)-octane (\( C_8H_{18} \)) is subjected to catalytic dehydrocyclization in the presence of \( Cr_2O_3/Al_2O_3 \) at 873 K:
- The process involves the formation of cyclic products.
- Only products with un-rearranged structures are considered, meaning the linear carbon chain is used to form the rings without rearrangement.
- Cyclic products are formed by dehydrogenation, leading to cyclization with no changes to the linear sequence of carbon atoms.