The IUPAC name of `underset(Br)underset(|) CH_2 - underset(CONH_2)underset(|) CH - overset(O)overset(||) C - CH_2 - CH_3 `is

Options

A. 2-(Bromomethyl)-3-oxopentane carboxamide
B. 1-Bromo-2-carbamoylpentan-3-one
C. 5-Bromo-4-carbamoylpentan-3-one
D. 2-(Bromomethyl)-3-oxopentanamide

Explanation

To determine the IUPAC name of the compound with the structure given, we can follow these steps:

### Step 1: Identify the Functional Groups
The compound contains:
- An amide group (CONH2)
- A ketone group (C=O)
- A bromine substituent (Br)

### Step 2: Determine the Parent Carbon Chain
We need to identify the longest continuous carbon chain that includes the functional group. In this case, the longest chain consists of 5 carbon atoms.

### Step 3: Number the Carbon Chain
According to IUPAC nomenclature, the functional group takes precedence over substituents. Therefore, we will number the carbon chain starting from the end closest to the amide group (CONH2).
- Numbering:
- Carbon 1: Amide group (CONH2)
- Carbon 2: Bromine substituent
- Carbon 3: Ketone group (C=O)
- Carbon 4:
- Carbon 5:

### Step 4: Identify the Substituents and Their Positions
- On Carbon 2, there is a bromine substituent, which we name as "bromomethyl."
- On Carbon 3, there is a ketone group, which we denote as "oxo."

### Step 5: Combine the Names
Now we can combine the names of the substituents and the parent chain:
- The parent chain is "pentane" (5 carbon atoms).
- The substituents are:
- 2-bromomethyl
- 3-oxo

### Step 6: Add the Functional Group Suffix
Since the compound contains an amide group, we will add the suffix "amide" to the name of the parent chain.

### Final IUPAC Name
Putting it all together, the IUPAC name of the compound is:
**2-bromomethyl-3-oxo-pentaneamide**

### Summary of Steps
1. Identify functional groups.
2. Determine the longest carbon chain.
3. Number the carbon chain from the end nearest to the highest priority functional group.
4. Identify substituents and their positions.
5. Combine the names of the substituents and the parent chain.
6. Add the suffix for the functional group.