Identify the INCORRECT pair from the following options.
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A.
Cyclopropane - homocyclic
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B.
Tetrahydrofuran - heterocyclic
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C.
Aniline - aromatic
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D.
Thiophene - homocyclic
Correct Answer:
D. Thiophene - homocyclic
Explanation:
The incorrect pair is Thiophene - homocyclic.
A homocyclic compound consists of a ring structure made up entirely of carbon atoms. In contrast, a heterocyclic compound contains at least one atom other than carbon, such as nitrogen, oxygen, or sulfur, within its ring.
Thiophene is a five-membered aromatic ring that includes a sulfur atom. Because the sulfur atom is part of the ring structure itself, thiophene is classified as a heterocyclic compound, not a homocyclic one.
The other pairs are correct: - Cyclopropane is homocyclic because its three-membered ring consists only of carbon.
- Tetrahydrofuran is heterocyclic because its five-membered ring contains an oxygen atom.
- Aniline is aromatic because it contains a benzene ring, which meets the criteria for aromaticity.
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