1.4: Conformational Analysis Answers
- Page ID
- 218638
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1)
2) D
3) Conformations are different arrangements of the same molecule formed by rotations about single bonds.
4)
5)
6) C
7) E – cyclopropane, due to its high ring strain.
8) B
9) The angle strain arises from the compression of the ideal tetrahedral bond angle of 109.5o to 60o. The large torsional strain occurs since all C-H bonds on adjacent carbons are eclipsed.
10) A
11)
12)
13) D
14) A
15)
16) D
17) C (see table 3-6 in the textbook)
18)
19)
20)
21) E
22) anti < gauche < eclipsed < totally eclipsed
23) A – all alkyl groups are equatorial.
The most stable conformation has to be a chair and the bulkiest group (isopropyl) has to be equatorial. The ethyl group has to be cis to isopropyl, and the methyl group has to be trans to ethyl.