IUPAC name of `CH_(3)"COCH"_(3)` is

Options

A. Acetone
B. 2-propanone
C. Dimethyl ketone
D. Propanal

Explanation

To determine the IUPAC name of the compound `CH₃COCH₃`, we will follow these steps:

### Step 1: Identify the Structure
The given compound can be represented as:
```
CH₃
|
CO
|
CH₃
```
This shows that we have a carbon chain with a carbonyl group (C=O) attached.

### Step 2: Determine the Longest Carbon Chain
The longest carbon chain in this compound consists of three carbon atoms:
1. The first carbon (C1) is attached to a methyl group (CH₃).
2. The second carbon (C2) is the carbonyl carbon (C=O).
3. The third carbon (C3) is also attached to a methyl group (CH₃).

### Step 3: Number the Carbon Chain
We need to number the carbon chain in such a way that the functional group (the carbonyl group in this case) gets the lowest possible number.
- Starting from the left, we have:
- C1: CH₃
- C2: CO (carbonyl)
- C3: CH₃

Thus, the numbering is:
1. C1 - CH₃
2. C2 - CO
3. C3 - CH₃

### Step 4: Identify the Functional Group
The functional group present in this compound is a ketone (C=O). Since the carbonyl group is located at C2, we will use the suffix "-one" in the name.

### Step 5: Construct the Name
- The longest chain has three carbons, which corresponds to the prefix "prop".
- Since the carbonyl group is at position 2, we add "2-" before the suffix.
- The suffix for a ketone is "-one".

Combining these, we get the name:
**2-propanone**

### Final Answer
The IUPAC name of `CH₃COCH₃` is **2-propanone**.

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