1. Draw an accurate Lewis structure for the following molecules, including all nonbonded electron pairs, and provide the bond angle around all carbon atoms.
 

a. formaldehyde (HCHO):
b. hydrogen sulfide:
c. acetonitrile (CH3CN)

2. In which molecule is the carbon-carbon bond length the longest:

ethane (CH₃CH₃), acetylene (HC CH), or ethylene (H₂C=CH₂)? _________ethane__________

Which of the above molecules has the greatest number of pi electrons? __acetylene__

3. Indicate the hybridization (sp³, sp², or sp) of every atom (except hydrogen) in each structure in question 1. Use an arrow pointing to each atom to make your assignments, for example: [omitted]