Chemistry 251/253
Sample Assignment
INSTRUCTIONS
This page provides a 5-question sample of a typical on-line assignment. When you click the Answer Form button, a new window containing an Answer Form will open. Click the Load JavaGrins link in this new window to open a JavaGrins chemical structure drawing window. Arrange the JavaGrins drawing window, the Answer Form window, and this window so that you can go back and forth between all three. For questions that require SMILES, click the mouse in the appropriate text field on the Answer Form, then click on the link called Paste: SMILES. For multiple choice and fill-in-the-blank questions, type your answer in the appropriate text field of the Answer Form. If you would like to submit your answers for this exercise, fill in your first and last names and enter 123123456 into the SS# field on the Answer Form. Then click thebutton. After you submit your work, you should receive confirmation that it has been received.
1. One of the following representations of an MO is incorrect. Which one?
2. Arrange the following alkenes in order of increasing electron density in the double bond. Enter your answer as a 4-digit number with the pi system with lowest electron density first and that with the highest electron density last, e.g. 1234.
3. Al. D. Hyde wanted to prepare a series of compounds with the general structure . Which of the following reaction schemes would be least likely to succeed.
4. The H-NMR spectrum of the product of the following reaction is shown below. Draw the structure of the product. N.B. If you do not want to take the time to draw a structure, you may simply enter some text into the text field associated with this question.
5. Consider the following reaction:
Comparing the experimental ratio of 2-chlorobutane to 1-chlorobutane with the theoretical ratio, i.e. the ratio you would expect based on the numbers of primary and secondary hydrogens in butane, allows you to evaluate the reactivity of a secondary hydrogen relative to that of a primary hydrogen in free radical chlorination reactions. Based on the data provided, calculate the relative reactivity of a secondary hydrogen compared to that of a primary hydrogen. Express your answer to two significant figures.
