2) Because the electronegativities of C and H are very similar and C-H bonds are very short, a C-H bond

is essentially nonpolar.

a. Draw the Lewis structure for propane, CH3CH2CH3.

b. Explain whether the dipole moment of propane is zero or non-zero.

c. Do you expect you answer to part b) to apply to all molecules that contain only C-C single

bonds and C-H bonds? (These molecules are called alkanes.)