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 \(A\) : Benzene is more stable than hypothetical cyclohexatriene. Reason \(R\) : The delocalized \(\pi\) electron cloud is attracted more strongly by nuclei of carbon atoms. In the light of the above statements, choose the correct answer from the options given below:

A \(A\) is true but \(R\) is false.
B \(A\) is false but \(R\) is true.
C Both \(A\) and \(R\) are correct and \(R\) is the correct explanation of \(A\).
D Both \(A\) and \(R\) are correct but \(R\) is NOT the correct explanation of \(A\).

Verified Solution

Answer & Solution

Correct Answer

(C) Both \(A\) and \(R\) are correct and \(R\) is the correct explanation of \(A\).

Step-by-step Solution

Detailed explanation

Assertion \(- A\) : Benzene is more stable than cyclohexatriene (True) Reason \(- R :\) Delocalised \(\pi-\) e cloud lies \(B.M.O\) so more attracted by nuclei of carbon atom. (True and Correct Explanation)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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