Question
The IUPAC name of the following compound is?
CH3−CH2−CH2−C|HCH3−CH2−CH3|CH−CH3
CH3−CH2−CH2−C|HCH3−CH2−CH3|CH−CH3
Answer: Option A
:
A
Our first step should be to choose the longest chain from the given alkane.
Although there are 9 carbonatoms in total, the longest chain contains only 7 carbon atoms.
Primary suffix =ane
Word root = hept
If we number the chain, as shown above, the two methyl substituents are at C4 and C6
Now, let's look at another case.
Now we have substituents at C2andC4. In both cases, there are exactly two substituents.
We choose thenumbering direction that gives the lowest set of locants.
Hence, secondary prefix = 2,4-dimethyl (since there are two methyl groups-one each at C2andC4
Hence, the IUPAC name is 2,4-Dimethylheptane
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:
A
Our first step should be to choose the longest chain from the given alkane.
Although there are 9 carbonatoms in total, the longest chain contains only 7 carbon atoms.
Primary suffix =ane
Word root = hept
If we number the chain, as shown above, the two methyl substituents are at C4 and C6
Now, let's look at another case.
Now we have substituents at C2andC4. In both cases, there are exactly two substituents.
We choose thenumbering direction that gives the lowest set of locants.
Hence, secondary prefix = 2,4-dimethyl (since there are two methyl groups-one each at C2andC4
Hence, the IUPAC name is 2,4-Dimethylheptane
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