Chemistry 341
Practice Quiz #1 Answers

1. Draw the conformations of ethane every 60^o, as the molecule rotates through 360^o.

2. Draw all resonance forms for the anion NC-CH=CH-CH₂ ^-. Indicate the hybridization of each atom (excluding H). Draw the conjugate acid of this anion. [Note: Lone pairs not shown].
RESONANCE FORMS:

CONJUGATE ACID is one of

3. What is the systematic name for the following alkane?

Above numbers give 3-ethyl-2,4-dimethyloctane. Choose the longest chain, and start from the end nearest a substituent.

4. Draw in the product of the following reaction:

5. Which is the most stable of the following, and why?

Cyclopentane is the most stable, because its bond angles are close to 109.5^o, the ideal for sp³ carbons.  In the smaller rings, the bond angle is much smaller than ideal, and therefore these have ring strain and are much less stable.

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