ABC26OR0017 · General Organic Chemistry

Subject: Organic Chemistry · Chapter: General Organic Chemistry · Topic: Conformational Analysis · Exam: CSIR-NET DEC 2012 · Marks: 2 · Difficulty: Medium

Given the energy of each gauche butane interaction is $0.9 \mathrm{kcal} / \mathrm{mol}, \mathrm{G}$ value of the following reaction is structure structure structure (e,e conformer)
(a)$0.9 \mathrm{kcal} / \mathrm{mol}$
(b)$1.8 \mathrm{kcal} / \mathrm{mol}$
(c)$2.7 \mathrm{kcal} / \mathrm{mol}$
(d)$3.6 \mathrm{kcal} / \mathrm{mol}$
Answer
Answer (as printed): B
Explanation
MeB is gauche with MeA, C2-C3 and C5-C6 bond. So, total energy $= 2\times0.9 = 1.8$ kcal/mol.

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