Predict the splitting patterns you would expect for each proton in the molecules below. c. doublet a. septet H CH3 b. singlet d. quartet C1 H

The Newman projection looking down the indicated bond in the following species is best represented by which of the following (I, II, III, IV, or V)

What are the configurations of the two stereogenic carbon atoms in this molecule? CI H 5 6 O 3 2 4 H3C H A. (3R, 6R) B. (3R, 6S) OC. (3S, 6R) OD. (3S, 6S)

2. Determine the absolute configuration (R/S) of the molecules below. CI H NH,

Propanal (bp 48°C) and propanol (bp 97°C), both found on Table 4.2, have very similar surfaceareas and dipole moments. Construct an explanation for the large difference in boiling pointsbetween the two.

Be sure to answer all parts. Januvia, the trade name for sitagliptin, was introduced in 2006 for the treatment of type 2 diabetes. In what type of orbital does the lone pair on each N atom reside. CF3 F N. N 4 N. NH2 1 F N 1: sp orbital N 2: (select) orbital N 3: (select) orbital N 4: sp2 orbital N 5: sp? orbital 2)

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1. What is the absolute configuration of the molecule shown? H OH за b. H CH да НО-С OH HỌC CHI CH •H .COH OH

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2. Describe what orbitals make each bond in the following molecule, and identify each bond as o or . H H H I-N: H :0: || C I—Z: N H C=C-H