Chapter 1: Structure Determines Properties Ch 2 contents

Lewis Diagrams Answers

1.  The compounds are H2, BH3, CH4, NH3, H2O and HF:
 
 


Lewis diagrams of first row hydrides


 






2.   Draw Lewis diagrams for the following inorganic reagents:  HNO3, H2SO4, and sodium azide.

Lewis diagrams of inorganic reagents
3.  The Lewis diagrams for the molecules are shown (these were selected to represent important classes of organic molecules that you will be seeing a lot of in the future : note it is very important to know where the lone pairs are in the structures). Note that none of these structures have any formal charges and all the C, N, O (and I) atoms have complete octets.


 














Resonance:

3.  Many carbonyl containing compounds such as ketones react with bases to give enolate ions.   Consider [CH3CH-C(O)-CH3]- (but-3-ene-2-olate), can you find the two major resonance structures for this molecule.

4.  Aromatic ring systems often display resonance, show what the electron delocalization in a compound like p-nitroaniline would be like.