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  4. Which of the following is the correct IUPAC name?

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Q. Which of the following is the correct $IUPAC$ name?

Organic Chemistry – Some Basic Principles and Techniques

Solution:

While writing the name of the substituents in alphabetical order, the prefixes such as di, tri, tetra, penta, hexa, etc. are not considered. Therefore, as "e" of ethyl comes before "m" of dimethyl thus, lower locant 3 assigned to ethyl group and is written first. Hence, the correct IUPAC name is 3-Ethyl-4,4-dimethylbutane.