Which of the following name is correct :-

Options

A. 4-Isopropyl-3-methyl hexane
B. 2-Ethyl-3-isopropyl pentane
C. 3-Isopropyl-4-methyl hexane
D. 3-Ethyl-2,4-dimethyl hexane

Answer

To determine which of the given names is correct according to IUPAC nomenclature, we will analyze each option step by step.

### Step 1: Analyze the first option - 4-isopropyl-3-methylhexane
1. **Identify the longest carbon chain**: The longest chain here is hexane (6 carbons).
2. **Identify the substituents**: There is an isopropyl group at position 4 and a methyl group at position 3.
3. **Number the carbon chain**: Number the chain from the end closest to the first substituent:
- 1 (C1) - C2 - C3 (methyl) - C4 (isopropyl) - C5 - C6
4. **Write the IUPAC name**: The correct name should prioritize the substituents alphabetically. The correct name is 3-ethyl-2,4-dimethylhexane.

### Step 2: Analyze the second option - 2-ethyl-3-isopropylpentane
1. **Identify the longest carbon chain**: The longest chain is pentane (5 carbons).
2. **Identify the substituents**: There is an ethyl group at position 2 and an isopropyl group at position 3.
3. **Number the carbon chain**: Number the chain from the end closest to the first substituent:
- 1 (C1) - C2 (ethyl) - C3 (isopropyl) - C4 - C5
4. **Write the IUPAC name**: The correct name should be 3-isopropyl-2-ethylpentane, as the substituents should be listed in alphabetical order.

### Step 3: Analyze the third option - 3-isopropyl-4-methylhexane
1. **Identify the longest carbon chain**: The longest chain is hexane (6 carbons).
2. **Identify the substituents**: There is an isopropyl group at position 3 and a methyl group at position 4.
3. **Number the carbon chain**: Number the chain from the end closest to the first substituent:
- 1 (C1) - C2 - C3 (isopropyl) - C4 (methyl) - C5 - C6
4. **Write the IUPAC name**: The correct name should be 3-isopropyl-4-methylhexane, which is correct as per the structure.

### Step 4: Analyze the fourth option - 3-ethyl-2,4-dimethylhexane
1. **Identify the longest carbon chain**: The longest chain is hexane (6 carbons).
2. **Identify the substituents**: There are ethyl groups at positions 2 and 4 and a methyl group at position 3.
3. **Number the carbon chain**: Number the chain from the end closest to the first substituent:
- 1 (C1) - C2 (ethyl) - C3 (methyl) - C4 (ethyl) - C5 - C6
4. **Write the IUPAC name**: The correct name should be 2,4-dimethyl-3-ethylhexane, as the substituents should be listed in alphabetical order.

### Conclusion:
After analyzing all options, it is clear that the correct IUPAC name is **3-ethyl-2,4-dimethylhexane**.