Question

Two statements, one Assertion and the other Reason are given. Choose the correct option.
Assertion: Heterocyclic compounds like Pyridine and Thiophene are non-aromatic compounds.
Reason: According to Hückel's rule for a given compound to exhibit aromaticity, the molecule must be planar, cyclic system having delocalized \( (4n + 2) \pi \) electrons.

• A. Assertion is correct but Reason is incorrect.
• B. Both Assertion and Reason are incorrect.
• C. Reason is correct but Assertion is incorrect.
• D. Both Assertion and Reason are correct.

Hint:

Hückel's rule applies to aromatic compounds and states that they must have a cyclic, planar structure with \( (4n + 2) \pi \) electrons, where \( n \) is a non-negative integer. Pyridine and Thiophene both meet these conditions and are aromatic compounds.

Answer 1

The Correct Option is C

Step 1: Analyze the Assertion.
The assertion states that heterocyclic compounds like Pyridine and Thiophene are non-aromatic. This statement is incorrect. Both Pyridine and Thiophene are aromatic compounds, not non-aromatic. Pyridine has a six-membered ring with a nitrogen atom, and Thiophene has a sulfur atom, both of which follow Hückel's rule for aromaticity.

Step 2: Analyze the Reason.
The reason given is correct. According to Hückel's rule, a molecule exhibits aromaticity if it is planar, has a cyclic structure, and contains \( (4n + 2) \pi \) electrons in the delocalized system, where \( n \) is an integer. This rule applies to both Pyridine and Thiophene, which both follow this rule and are thus aromatic compounds.

Step 3: Combine the Assertion and Reason.
While the reason is correct, the assertion is incorrect. Therefore, the correct answer is option (C), where the reason is correct but the assertion is incorrect.