JEE Mains · Chemistry · STD 11 - 9. Hydricarbon
Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason \(R\). Assertion \(A\) :\([6]\) Annulene.\([8]\) Annulene and cis - \([10]\) Annulene, are respectively aromatic, not-aromatic and aromatic. Reason \(R\) : Planarity is one of the requirements of aromatic systems. In the light of the above statements, choose the most appropriate answer from the options given below.
- A Both \(A\) and \(R\) are correct and \(R\) is the correct explanation of \(A\).
- B Both \(A\) and \(R\) are correct but \(R\) is NOT the correct explanation of \(A\).
- C \(A\) is correct but \(R\) is not correct.
- D \(A\) is not correct but \(R\) is correct.
Answer & Solution
Correct Answer
(D) \(A\) is not correct but \(R\) is correct.
Step-by-step Solution
Detailed explanation
If this annulene with five cis double bonds were planar, each internal angle would be \(144^{\circ}\). Since a normal double bond has bond angle of \(120^{\circ}\), this would be from ideal. This compound can be made but it does not adopt a planar conformation and therefore is…
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