Iupac name for the this ?

4–Ethyl–3–methlyheptane.

Explanation:

To name the above compound, do the following.

1. Locate the longest continuous carbon chain. This gives the parent name of the compound. In this case the longest continuous chain is carbon 7 i.e heptane since the compound is saturated.

2. Identify the substituent groups attached. In this case, the substituent groups attached are:

Methyl => CH3.

Ethyl => CH2CH3.

3. Locate the position of the substituent groups by giving them the lowest possible low count alphabetically. Ethyl comes before methyl alphabetically so, we start counting from the side that gives ethyl the lowest count. In this case,

Ethly assume same position from either side of the compound. Therefore, we'll consider the lowest possible count for methyl.

Ethyl is at carbon 4.

Methyl is at carbon 3.

4. Combine the above to obtain the name of the compound.

Therefore, name of the compound is:

4–Ethyl–3–methlyheptane.