Try to draw the structual formula for propanoic acid.

a. The reaction of chlorine with methane is called a substitution reaction. Why?

b. What special condition is needed for this reaction?

Ethane reacts with chlorine, in a substitution reaction.

a. Draw the structural formula for each compound that can form, as the reaction proceeds. (Isomers too!)

b. Write the formula for each compound in a.

The compound ${\mathrm{C}}_5{\mathrm{H}}_{12}$ has three isomers.

a. Draw the structures of these isomers.

b. Their boiling points are 9.5, 28, and 36 degree Celsius. Match these to your drawings, and explain your choice. 

a. Name the two simplest alkenes.

b. Now draw their structural formulae.

What makes alkenes react so differently from alkanes?