Is this a correct structure?

CH3CH2
CH3CHCHCH2CH3
CH3

with a name of 3-ethyl 4-methyl hexane?

I don't know how you have it bonded, but it appears to me to be pentane (only five in the long chain

For 3-ethyl 4-methyl its : CH3-CH2-CH(C2H5)-CH(CH3)-CH2-CH3

To determine if the structure and name align correctly, we can follow a step-by-step process to name the compound.

1. Identify the parent chain: Look for the longest continuous carbon chain in the structure. In this case, the longest chain has six carbon atoms (hexane).

CH3CH2
CH3CHCHCH2CH3
CH3

2. Number the carbon atoms: Start numbering from one end of the chain closest to the first substituent encountered. In this case, we can number from either end, but let's start from the left.

1 2 3 4 5 6
CH3CH2
CH3CHCHCH2CH3
CH3

3. Add substituents: Identify and locate any substituent groups attached to the parent chain. In this structure, we have three substituents: ethyl (C2H5) at position 3 and three methyl (CH3) groups at positions 4, 4, and 5.

1 2 3 4 5 6
CH3CH2
CH3CHCHCH2CH3
CH3

| |
CH2CH3

| | |
CH3CHCHCH2CH3
CH3

4. Arrange substituents alphabetically: When multiple substituents are present, arrange them alphabetically. In this case, CH2CH3 (ethyl) comes before CH3 (methyl), so they are listed as ethyl and then methyl, respectively.

1 2 3 4 5 6
CH3CH2
CH3CHCHCH2CH3
CH3

| |
CH2CH3

| | |
CH3CHCHCH2CH3
3-Ethyl-4,4-dimethyl-5-methylhexane

5. Write the name: Combine the names of the substituents with the parent chain's name, using hyphens to separate the numbers indicating substituent positions. The correct name for the molecule is 3-ethyl-4,4-dimethyl-5-methylhexane.

Therefore, the given name "3-ethyl 4-methyl hexane" does not match the actual structure of the compound described.