One among the following is the correct IUPAC name for the
compound `CH_(3)CH_(2)-overset(H)overset(|)N-overset(H)overset(|)C=O`

Options

A. N-Formylaminoethane
B. N-Ethylformylamine
C. N-Ethylmethanamide
D. Ethylaminomethanal

Answer

To determine the correct IUPAC name for the compound `CH3CH2-NH-C=O`, we will follow these steps:

### Step 1: Identify the structure
The compound can be broken down as follows:
- `CH3CH2` indicates an ethyl group.
- `NH` indicates the presence of an amine functional group.
- `C=O` indicates a carbonyl group, which is part of an amide.

### Step 2: Determine the functional groups
In this compound, we have an amide functional group (due to the presence of `C=O` bonded to `NH`). The carbonyl carbon is bonded to the nitrogen, which is also bonded to the ethyl group.

### Step 3: Identify the longest carbon chain
The longest carbon chain that includes the carbonyl carbon is one carbon long (the carbonyl carbon), which means the base name will be derived from methane (1 carbon).

### Step 4: Naming the substituents
The ethyl group (`CH3CH2`) is a substituent on the nitrogen atom. In IUPAC nomenclature, when a substituent is attached to the nitrogen of an amide, we use the prefix "N-" to indicate this.

### Step 5: Combine the names
Since we have:
- An ethyl group attached to the nitrogen (`N-ethyl`)
- A carbonyl group that makes it an amide (methanamide)

The full IUPAC name is constructed as follows:
- The substituent (ethyl) is indicated first, followed by the base name of the amide (methanamide).

Thus, the correct IUPAC name for the compound is **N-ethyl methanamide**.

### Final Answer
N-ethyl methanamide

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