Can somebody please verify the IUPAC name of these molecules?

May 2013
12
0
Hello!

Can somebody please let me know if these are correct and if not where am I going wrong? Thanks!

1) 6-ethyl-3-methylnon-4-yn-2-one

2) 5-ethyl-2-methyloct-2-en-4-one

3) 1-bromo-5-methylhept-3-yn-2-ol

4) 3-ethyl-6-methyloct-3-en-5-ol

5) Is it 7-fluoro-4-methyloct-5-yn-3-one or 2-fluoro-5-methyloct-3-yn-5-one?

If anybody can please help me that would be great! Thanks!
 

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