What is the IUPAC name for the following compound? 5-Methyl-5-hexen-2-ol 6-Methyl-6-hepten-2-ol...

Question:

What is the IUPAC name for the following compound?

a. 5-Methyl-5-hexen-2-ol

b. 6-Methyl-6-hepten-2-ol

c. 6-Hydroxy-2-methylheptene

d. 6-Hydroxy-2-methyl-1-heptene

IUPAC nomenclature

The name of an organic compound is given by using the rules which are proposed by the International Union of Pure and Applied Chemistry. The functional groups are also named according to their priority order.

Answer and Explanation:


a.The structure of 5-Methyl-5-hexen-2-ol is shown below.

Given Compound

According to the IUPAC rules, select the longest hydrocarbon chain first. Then find out the highest priority group so that it gets the lowest locant number.

In this case, alcohol gets higher priority over the alkene group. The name of a compound is given by using lowercase alphabets and by mentioning the positions of each functional group before its name.

The numbering of the given compound with the longest hydrocarbon chain is shown below.

5-methylhex-5-en-2-ol

There is one methyl group at C5, one alkene group at C5 and one hydroxyl group at C2 position is present and the longest hydrocarbon chain is of 6 carbon atoms.

Therefore, the IUPAC name of this compound is 5-methylhex-5-en-2-ol.

b.The structure of 6-Methyl-6-hepten-2-ol is shown below.

Given Compound

According to the IUPAC rules, select the longest hydrocarbon chain first. Then find out the highest priority group so that it gets the lowest locant number.

In this case, alcohol gets higher priority over the alkene group. The name of a compound is given by using lowercase alphabets and by mentioning the positions of each functional group before its name.

The numbering of the given compound with the longest hydrocarbon chain is shown below.

6-methylhept-6-en-2-ol

There is one methyl group at C6, one alkene group at C6 and one hydroxyl group at C2 position is present and the longest hydrocarbon chain is of 7 carbon atoms.

Therefore, the IUPAC name of this compound is 6-methylhept-6-en-2-ol.

c.The structure of 6-Hydroxy-2-methylheptene is shown below.

Given Compound

According to the IUPAC rules, select the longest hydrocarbon chain first. Then find out the highest priority group so that it gets the lowest locant number.

In this case, alcohol gets higher priority over the alkene group. The name of a compound is given by using lowercase alphabets and by mentioning the positions of each functional group before its name.

The numbering of the given compound with the longest hydrocarbon chain is shown below.

6-methylhept-6-en-2-ol

There is one methyl group at C6, one alkene group at C6 and one hydroxyl group at C2 position is present and the longest hydrocarbon chain is of 7 carbon atoms.

Therefore, the IUPAC name of this compound is 6-methylhept-6-en-2-ol.

d.The structure of 6-Hydroxy-2-methyl-1-heptene is shown below.

Given Compound

According to the IUPAC rules, select the longest hydrocarbon chain first. Then find out the highest priority group so that it gets the lowest locant number.

In this case, alcohol gets higher priority over the alkene group. The name of a compound is given by using lowercase alphabets and by mentioning the positions of each functional group before its name.

The numbering of the given compound with the longest hydrocarbon chain is shown below.

6-methylhept-6-en-2-ol

There is one methyl group at C6, one alkene group at C6 and one hydroxyl group at C2 position is present and the longest hydrocarbon chain is of 7 carbon atoms.

Therefore, the IUPAC name of this compound is 6-methylhept-6-en-2-ol.


Learn more about this topic:

Chemical Nomenclature for Organic Compounds
Chemical Nomenclature for Organic Compounds

from Virginia SOL - Chemistry: Test Prep & Practice

Chapter 6 / Lesson 1
897

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