The IUPAC name of the following compound
`H_(3)C-CH_(2)-underset(CH_(2)CH_(3))underset(|)CH-CH_(2)-underset(CH_(3))underset(|)CH-CH_(2)-CH_(3)`

Options

A. 3-ethyl-5-methylheptane
B. 5-ethyl-3-methylheptane
C. 3,5-dicthylhexane
D. 1, 1-diethyl-3-methylpentane

Explanation

To determine the IUPAC name of the given compound, we will follow these steps:

### Step 1: Identify the Longest Carbon Chain
First, we need to identify the longest continuous carbon chain in the compound. By counting the carbon atoms, we can see that there are 7 carbon atoms in the main chain.

### Step 2: Determine the Base Name
Since the longest chain has 7 carbon atoms, the base name of the compound will be "heptane," as "hept-" indicates seven carbons and "-ane" indicates that it is an alkane (all single bonds).

### Step 3: Identify the Substituents
Next, we need to identify the substituents (branches) attached to the main chain:
- There is an ethyl group (C2H5) attached to the third carbon.
- There is a methyl group (CH3) attached to the fifth carbon.

### Step 4: Number the Carbon Chain
We number the carbon chain starting from the end closest to the first substituent to give the lowest possible numbers to the substituents:
1. C1 - CH3
2. C2 - CH2
3. C3 - CH (with ethyl group)
4. C4 - CH2
5. C5 - CH (with methyl group)
6. C6 - CH2
7. C7 - CH3

### Step 5: Write the IUPAC Name
Now we can combine the substituents with the base name:
- The substituents are listed in alphabetical order, regardless of their position numbers.
- Therefore, we write "3-ethyl" before "5-methyl."

Putting it all together, the IUPAC name of the compound is **3-ethyl-5-methylheptane**.

### Summary of the Steps:
1. Identify the longest carbon chain (7 carbons).
2. Determine the base name (heptane).
3. Identify the substituents (ethyl and methyl).
4. Number the carbon chain to give the lowest numbers to the substituents.
5. Combine the substituents with the base name in alphabetical order.