AP EAMCET · Chemistry · General Organic Chemistry

Assertion (A) Cyclohexane is the most stable cycloalkane.

Reason (R) Cyclopropane and cyclobutane are less stable due to angle strain and torsional strain.
The correct answer is

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

Verified Solution

Answer & Solution

Correct Answer

(A) Both (A) and (R) are true but (R) is not the correct explanation of (A).

Step-by-step Solution

Detailed explanation

In cycloalkane the heat of combustion of cyclohexane \(\left(657.9 \mathrm{~kJ} \mathrm{~mol}^{-1}\right)\) is the lowest hence it is the most stable cycloalkane. Cyclopropane and cyclobutane are less stable due to angle strain and torsional strain, therefore cyclopropane and…

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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Assertion (A) Cyclohexane is the most stable cycloalkane.Reason (R) Cyclopropane and cyclobutane are less stable due to angle strain and torsional strain.The correct answer is

Step-by-step Solution

Assertion (A) Cyclohexane is the most stable cycloalkane.

Reason (R) Cyclopropane and cyclobutane are less stable due to angle strain and torsional strain.
The correct answer is