CHEM 2070 Prelim 2 Fall 2012 - 1(a(22 points Below is drawn...

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General, Organic, & Biological Chemistry
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Chapter 4 / Exercise 2
General, Organic, & Biological Chemistry
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1. (a) (22 points) Below is drawn a skeletal Lewis structure for the molecule carvone, which you sniffed in class. Add bonds and/or lone pairs as required so that the picture represents a Lewis structure indicating bonding patterns in the molecule carvone. How many σ bonds (most easily, classified by type as indicated) and how many π bonds (of any kind) are found in this molecule? If this molecule exists in distinct stereoisomers, indicate by placing a star next to the relevant optical center(s). (Please do not infer any information from the lengths or orientations of bonds in the skeletal structure; they are drawn solely to indicate connectivities!). (b) (10 points) There are 10 C atoms in the skeleton of carvone show above. For the molecule as you have drawn it , count the number of sp , sp 2 and sp 3 hybridized centers (at the C atoms, only!). # sp centers # sp 2 centers # sp 3 centers 1
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General, Organic, & Biological Chemistry
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Chapter 4 / Exercise 2
General, Organic, & Biological Chemistry
Stoker
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2. (a) (2 points) You are told that a given triatomic molecule has a measured bond angle of about 120 . What can you tell about the steric number in this compound? (b) (6 points) You are told that a given triatomic molecule is linear; that is, the only bond angle is 180 . What can you tell about the steric number in this compound? (c) (24 points) Predict the molecular geometry for the following ions/molecules. XeF + 3 BrF + 2 CCl - 3 2

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