Q.

n-Octane in presence of Cr2O3/Al2O3/873 K changes to, how many cyclic product(possible). Do not consider re-arranged products.

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answer is 3.

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Detailed Solution

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Explanation:

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.
Possible Cyclic Products:
  1. Cyclohexane: A 6-membered ring with two methyl groups on adjacent carbons.
  2. Methylcyclopentane: A 5-membered ring with a methyl group attached to one of the ring carbons.
  3. Cyclobutane: A 4-membered ring with additional alkyl chains attached.

Answer: There are 3 possible cyclic products for n-octane under the given conditions.

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