Q11 · CSIR NET Chemistry, December 2013
Paper: CSIR NET December 2013 · Subject: Organic Chemistry · Chapter: General Organic Chemistry · Topic: General Organic Chemistry – General · Marks: 2 · Difficulty: Medium
Consider the following statements about cis- and trans-decalins (A) cis-isomer is more stable than trans-isomer (B) trans-isomer is more stable than cis-isomer (C) trans-isomer undergoes ring-flip (D) cis-isomer undergoes ring-flip The correct statements among the above are
(a)B and D
(b)A and C
(c)A and D
(d)B and C
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
trans-Decalin is more stable: no extra gauche interactions and both ring bonds equatorial. It is also conformationally locked. cis-Decalin can ring-flip. B and D (a).
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