Name this compound according to the IUPAC system

CH3
|
CH=C-CH-CH-CH3
|
CH3
Thank you.

To name the compound using the IUPAC system, we follow these steps:

1. Identify the longest continuous carbon chain in the molecule. In this case, it is a chain of five carbon atoms.

2. Number the carbon atoms in the chain, starting from the end that gives the substituents the lowest possible numbers. In this case, we start numbering from the left end.

CH3
|
CH=C-CH-CH-CH3
|
CH3

The chain is numbered as follows:

CH3 1
|
CH=C-CH-CH-CH3
|
CH3

3. Identify and name the substituents attached to the main chain. In this case, there are two methyl groups attached to the third and fourth carbon atoms.

CH3 1
|
CH=C-CH-CH-CH3
| |
CH3 CH3

The substituents are named as "3-methyl" and "4-methyl."

4. Combine the substituent names with the main chain name. Here, the main chain is a pentane, and the substituents are methyl groups attached to the third and fourth carbon atoms.

Therefore, the IUPAC name for the given compound is 3,4-dimethylpentane.

To name this compound using the IUPAC system, you will need to follow these steps:

1. Identify the longest continuous carbon chain in the molecule. In this case, it is a 5-carbon chain, which is a pentane.

2. Number the carbon atoms in the chain starting from the end closest to the highest priority functional group. In this case, we have a double bond, represented by the "CH=C" group. We want to give the double bond the lowest possible number, so we start numbering from the left end of the chain.

CH3-CH=CH-CH2-CH3
| | |
1 2 3

3. Name the substituents attached to the main chain. In this case, we have two methyl groups attached to the fourth and fifth carbon atoms.

CH3-CH=CH-CH(CH3)-CH3
| | |
1 2 3

The substituents are named alphabetically, so we write "3,4-diethyl" to represent two ethyl groups attached to the 4th and 5th carbon atoms.

4. Combine the names of the substituents and the parent chain, and separate them with hyphens. In this case, the IUPAC name for the given compound is 3,4-diethylpent-2-ene.

Therefore, the IUPAC name for the given compound is 3,4-diethylpent-2-ene.