Please Help!

1. In the following molecule, label all the indicated functional groups: 2. Why are functional groups so important in organic chemistry? 3. Give the IUPAC name for the following molecules 5. Give an example of determining whether an alkene receives an E or Z designation. Do all alkenes require this? Why or why not? 6. Draw a structure for the following molecules: (Z)-6-fluoro-7-methyloct-5-en-2-yne (E)-6-(1-methylpropyl)-7-fluoro-8-methylnon-4-ene 7. For each of the following pairs, indicate if they are identical or constitutional isomers or neither