Q7 · CSIR-NET Chemistry, June 2019
Paper: CSIR-NET June 2019 · 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 most stable conformation of the following molecule is: 
(a)
(b)
(c)
(d)
Answer
Under review — not yet confirmed.
Answer: B
Explanation
With an exocyclic isopropylidene next to the 2-methyl group, an equatorial Me would clash with the vinylic methyl (A^(1,3) strain); the methyl therefore goes axial — conformation (b).
Study loop for General Organic Chemistry