Understood your lastest explanation
So here's the answer for (b) and (c)
C - C - C - C
| |
C C
b . methyl pentane (I highlighted the longest C chain)
c.
C - C -
C
|
| |
C
C C
Still not very sure of this. But the way I look at it, the
longest C chain is as highlighted.. Err still methyl pentane? high
chances of getting it wrong.
Yes a) b) c) are all the same compound and all are
3-methylpentane.
The reason for giving these 3 questions is i want you and anyone
who bothers to read and try to know that the same compound can be
drawn differently yet is the exactly the same thing.
I do hope you understand why i have to add the 3 in front and do
note that for anything above 3C, you will need the numbering to be
officially correct.
Feel ready to attempt the more difficult 3 now? They should be
something out of the O's syllabus but will be needed for A's or
poly chemistry. If u are interested to learn and try, just read on
if not you can stop where you are.
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C - C - C - C - C - C - C -
C
|
|
C C
With the main chain highlighted, this organic compound has a
straight chain of 8C making it an octane. It also has 2 methyl groups (not
ethyl). If you call this methyloctane, this just means there is
1 methyl
group so how we name this will be calling it dimethyloctane.
For organic chemistry, we can name things using mono (1), bi
(2), tri (3), tetra (4) etc if there is more than 1 of the same
thing such as diethyl, trimethyl etc to a compound to tell the
person the number of such groups in a molecule.
The proper name for the above molecule will be
3,5-dimethyloctance (NOT 4,6-dimethyloctane)
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C - C - C - C - C - C - C -
C
|
|
C C - C
Now in this compound, we have the same octane parent chain and a
methyl and an ethyl group. For naming of such a molecule, you will
need to mention both side chains so this molecule is called
5-ethyl-3-methyloctane.
The 5 and 3 are to tell people the location of such side chains
and whether it is a methyl, ethyl, propyl etc.
For naming of side chains, it will be done by alphabetical order
so E comes before M so ethyl comes before methyl even though methyl
is a smaller chain and it comes earlier at position 3.
