Write the IUPAC name of the following molecule?

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BlackTom AI · Accepted Answer

First, observe that the molecule shown is a fairly simple alkane with multiple substituents attached to a continuous carbon backbone. The goal is to identify the longest carbon chain as the parent (parent name), then assign the lowest possible locants to the substituents.

Next, determine the longest continuous chain of carbon atoms. In the structure provided, the longest chain contains five carbon atoms, which corresponds to the parent name pentane.

Now locate the substituents and their positions on that five-carbon chain. The drawing shows two substituents attached to the same carbon of the chain: a methyl group and an ethyl group. The carbon bearing these two substituents is the third carbon of the pentane chain, giving the locant 3 for both substituents.

Consider the substituents and their proper order in the name. When listing substituents alphabetically, ethyl comes before methyl, even though they share the same carbon. Therefore, the substituents are labeled at carbon 3 as ethyl and methyl, resulting in the name 3-ethyl-3-methylpentane.

Double-checking the numbering: starting from either end of the pentane chain would place the substituents at carbon 3 in either direction, yielding the same locants, so the chosen numbering indeed gives the lowest set of locants and a correct, unambiguous name.

In summary, after selecting the longest chain (pentane) and identifying the substituents at C3 (ethyl and methyl), and then arranging substituents alphabetically, the IUPAC name is 3-ethyl-3-methylpentane.

My LMS Subjects Quiz 1

Write the IUPAC name of the following molecule?

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