What is the IUPAC name of the organic compound that has the formula shown below?
A.1,1-dimethylbutane
B.2-methylpentane
C. hexane
D.4-methylpentane

Option B. 2-methylpentane

Explanation:

To name a saturated organic compound, the following must be observed:

1. Locate the longest continuous carbon chain which inturn gives the parent name of the compound.

2. Detect the substituent group attached

3. Give the substituent group the lowest possible count.

4. Name the compound by combining the above.

Now let us name the compound given above. This is illustrated below:

1. The longest chain is carbon 5 which implies pentane.

2. The substituent group attached is methyl.

3. The substituent group attached is at carbon 2. (lowest possible count)

Therefore the name of the compound is:

2–methylpentane.

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