a) Too many hydrogens, or possibly missing a carbon, can't tell which carbon(s) the CH3 and CH2CH3 groups are bonded to. After you fix the structure, let me know what you think the name is!
b) Here's the structure using the fixed-width Courier font so that the bonds line up correctly:
CH2CH2CH3
|
CH3-CH-CH=C-CH=CH2
|
CH3
The main chain is in red. In alkenes, start numbering the main chain beginning at the end closest to a double bond. This is 3,5-dimethyl-1,3-octadiene.
c) This is simply 2-methyl-1-propene, commonly called isobutene.
d) Here's the structure again:
H CH3
| |
CH2=CH-C=C-CH2-C-CH2CH2CH3
| |
CH3 CH2CH3
Numbering from left to right (starting from the end closest to the double bond), we have 6-ethyl-3,6-dimethyl-1,3-nonadiene. The way the CH3 and H are drawn on the second double bond, you may have to identify the second double bond as E or Z (don't know if you've gotten to that topic yet, it's like trans and cis, but for more complex structures).
Steve
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