The correct IUPAC name of the following compound is:

![](https://app-content.cdn.examside.com/fly/@width/image/jaoe38c1mosg18mi/533dfb5f-8f07-4c6a-b102-a41f5208a818/3f6a04a0-4867-11f1-9a9b-01b18b992690/file-jaoe38c1mosg18mj.png?format=png)

Question

The correct IUPAC name of the following compound is:

![](https://app-content.cdn.examside.com/fly/@width/image/jaoe38c1mosg18mi/533dfb5f-8f07-4c6a-b102-a41f5208a818/3f6a04a0-4867-11f1-9a9b-01b18b992690/file-jaoe38c1mosg18mj.png?format=png)

Accepted Answer

A. 1. In IUPAC naming, the **longest continuous carbon chain** is chosen as the parent chain. Here, the longest chain contains **7 carbons**, so the parent name is **heptane**, not hexane.

2. Numbering of the parent chain must be done in the direction that gives the **lowest set of locants** to the substituents.

Given the positions of the ethyl and methyl groups on the chosen numbering,
$$
	ext{substituents are at position 3 (ethyl) and position 5 (methyl)}
$$

3. When writing the name, IUPAC rules require substituent prefixes to be listed in **alphabetical order** (ethyl before methyl), not in order of their locants.

Therefore,
$$
3	ext{-ethyl-5-methylheptane}
$$

Hence, the correct answer is **option A**.