IUPAC name is `NC-CH_(2)-CH_(2)-CONH_(2):-`

Options

A. 4-cyanobutane carboxamide
B. 3-emidopropanoic acid
C. 3-cyanopropanamide
D. 3-cyanopropan-1-oxo-1-amine

Answer

To determine the IUPAC name of the compound `NC-CH₂-CH₂-CONH₂`, we can follow these steps:

### Step 1: Identify the main functional group
The main functional group in the compound is the amide group (CONH₂). This group will dictate the suffix of the compound's name.

**Hint:** Look for the functional group that has the highest priority in naming.

### Step 2: Determine the longest carbon chain
Count the number of carbon atoms in the longest continuous chain that includes the amide group. In this case, there are three carbon atoms (C-C-C).

**Hint:** Identify the longest chain that includes the functional group.

### Step 3: Name the carbon chain
Since there are three carbon atoms in the longest chain, the base name will be "propane." However, since we have an amide group, we will change the suffix to "amide," resulting in "propanamide."

**Hint:** Remember to change the suffix based on the functional group present.

### Step 4: Assign the position of the functional groups
The amide group (CONH₂) is at position 1, as it is the highest priority functional group. The cyano group (CN) is at position 3. Therefore, we will include the position of the cyano group in the name.

**Hint:** Number the carbon chain starting from the end nearest to the highest priority functional group.

### Step 5: Combine the names
The cyano group is a substituent, and it will be indicated with a prefix. The complete IUPAC name will be "3-cyanopropanamide."

**Hint:** Combine the substituent name with the main chain name, ensuring to indicate the position of the substituent.

### Final Answer
The IUPAC name of the compound `NC-CH₂-CH₂-CONH₂` is **3-cyanopropanamide**.