Q7 · CSIR-NET Chemistry, June 2015
Paper: CSIR-NET June 2015 · Subject: Organic Chemistry · Chapter: General Organic Chemistry · Topic: Conformational Analysis · Marks: 2 · Difficulty: Medium
Under review — part of this question (a structure or an option) is not clear in the source scan. 4AB is checking it against the original book; the answer shown may change.
The hydrocarbon among the following having conformationally locked chair-boat-chair form is
(a)
(b)
(c)
(d)
Answer
Under review — not yet confirmed.
Answer: D
Answer: trans-syn-trans-Perhydroanthracene.
Explanation
Answer: trans-syn-trans-Perhydroanthracene — With trans ring fusions on both sides and the two outer rings syn, both outer chairs are locked. The central ring is then forced into a (twist-)boat, giving a locked chair–boat–chair system.
Study loop for General Organic Chemistry