The IUPAC name of the compound `CH_(3)-underset(H_(5)C_(2))underset(|)(N)-underset(O)underset(||)(C)-CH_(3)` is

Options

A. N-Acetyl-N-methylethanamine
B. N-Ethyl-N-methylethanamide
C. N-Acetyl-N-ethylethanamide
D. acetylethylmethylamine

Answer

To determine the IUPAC name of the compound `CH₃-CH₂-N(=O)-C(=O)-CH₃`, we can follow these steps:

### Step 1: Identify the Functional Groups
The compound contains an amide functional group (due to the presence of the nitrogen atom bonded to a carbonyl group) and two substituents (ethyl and methyl groups) attached to the nitrogen.

### Step 2: Determine the Parent Chain
The longest carbon chain that includes the carbonyl carbon is identified. In this case, the longest chain consists of two carbon atoms, which corresponds to ethane.

### Step 3: Naming the Amide
Since the compound contains an amide functional group, we will use the suffix "-amide" for the parent chain. The base name for the two-carbon chain is "ethane," so the amide will be named "ethanamide."

### Step 4: Identify and Name the Substituents
The substituents attached to the nitrogen are:
- An ethyl group (C₂H₅)
- A methyl group (CH₃)

When naming substituents on nitrogen, we use the prefix "N-" to indicate their attachment to the nitrogen atom. The order of naming substituents is based on alphabetical order:
- Ethyl (E) comes before Methyl (M).

Thus, we will name the substituents as:
- N-ethyl
- N-methyl

### Step 5: Combine the Names
Putting it all together, we combine the names of the substituents and the parent chain. The full IUPAC name of the compound is:
**N-ethyl-N-methyl-ethanamide**

### Final Answer
The IUPAC name of the compound `CH₃-CH₂-N(=O)-C(=O)-CH₃` is **N-ethyl-N-methyl-ethanamide**.

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