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Chemistry LibreTexts

1.4: Conformational Analysis Answers

  • Page ID
    218638
  • 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.

     
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