1.How many multiple bonds must a hydrocarbon have in order to be classified as unsaturated?2. What kind of ring do aromatic compounds contain? 3. What is a heteroatom? 4. Why do heteroatoms make such...

1.How many multiple bonds must a hydrocarbon have in order to be classified as unsaturated?2. What kind of ring do aromatic compounds contain? 3. What is a heteroatom? 4. Why do heteroatoms make such a difference in the physical and chemical properties of an organic molecule? 5. Why are low-formula-mass alcohols soluble in water? 6. What distinguishes an alcohol from a phenol? 7. What distinguishes an alcohol from an ether? 8. Which heteroatom is characteristic of an amine?