Key Concepts—Nuclear Magnetic Resonance Spectroscopy

Loosely held 7t electrons can either shield or deshield a nucleus. Protons on benzene rings and double bonds are deshielded and absorb downfield, whereas protons on triple bonds are shielded and absorb upfield (14.4). 

33 How many different types of protons are present in each compound  

34 Draw the structures for the four isomeric dihalides with molecular formula C3H6CI2 and label each different type of proton. 

35 How many H NMR signals does each compound give  

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