Organic chemistry is currently defined asa. the study of compounds made only by living cells.b. the study of carbon compounds.c. the study of natural (as opposed to synthetic) compounds.d. the study of hydrocarbons.

Which of the following are properties of hydrocarbons?

The two compounds


are related to each other by being __________.

A molecule has one carbon-carbon double bond and four monovalent atoms or groups. How many different cis-trans isomers exist for this molecule?

Pharmaceutical companies are selling billions of dollars' worth of single-enantiomer drugs. Why might it be important to use only one form of an enantiomer?

VISUAL SKILLS Visualize the structural formula of each of the following hydrocarbons. Which hydrocarbon has a double bond in its carbon skeleton?a. C3H8b. C2H6c. C2H4d. C2H2

VISUAL SKILLS Identify the asymmetric carbon in this molecule:

VISUAL SKILLS Which of the molecules shown in question 5 has an asymmetric carbon? Which carbon is asymmetric?

DRAW IT Draw Lewis dot structures for each hypothetical molecule shown below, using the correct number of valence electrons for each atom. Determine which molecule makes sense because each atom has a complete valence shell and each bond has the correct number of electrons. Explain what makes the other molecule nonsensical, considering the number of bonds each type of atom can make. b.