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CHM151PS 7KEYF07 - CHEMISTRY 151.001 Fall 2007 Problem Set...

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CHEMISTRY 151.001 Fall 2007 Problem Set 7 1. Indicate the type(s) of intermolecular attractive forces you would expect to hold each of the following molecules together (with other like molecules) in the liquid phase [(van der Waals attractive forces (VDW), dipole/dipole (DD), H-bonding (H)]. Rank the following molecules in terms of their relative boiling points (1=highest). Explain your reasoning. Attractive Intermolecular Forces Relative boiling point ______ ______ ______ 2. Below is a general depiction of DNA highlighting the H-bonds between the complementary base pairs (C-G and A-T). The structures of each of the bases are shown below. Draw in the H-bonds responsible for holding the strands of DNA together in the double helix (imagine the molecules are fixed as they are drawn below – do not spin or flip the molecules). Which base pair is more stable? N N N O N N sugar N N N O H H H H H sugar guanine cytosine N N O O H 3 C sugar thymine H N N N N N H H sugar adenine N H N NH 2 H DD VDW H DD VDW DD 1 2 3
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CHM 151 (HLS); Problem Set 7 2 3. Grignard and Organolithium Reagents. a. Circle the molecules that are most likely to react with a nucleophile . In each of these molecules indicate which ATOM is the most electrophilic (E+).
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