The IUPAC name of `NC - CH_2CH_2 -COOH` is

Options

A. Butane nitrolic acid
B. Carboxy propane nitrile
C. 3-cyanopropanoic acid
D. 4-cyanobutanoic acid

Answer

To determine the IUPAC name of the compound `NC - CH2CH2 - COOH`, we will follow these steps:

### Step 1: Identify the Functional Groups
The compound contains two functional groups:
1. A carboxylic acid group (-COOH)
2. A cyano group (-CN)

### Step 2: Determine the Parent Chain
The longest carbon chain that includes the highest priority functional group (the carboxylic acid in this case) will be selected as the parent chain. The carboxylic acid group has a higher priority than the cyano group.

### Step 3: Number the Carbon Chain
We will number the carbon chain starting from the end closest to the carboxylic acid group to give it the lowest possible number. In this case, the numbering will be as follows:
- COOH is at position 1
- The cyano group is at position 3

### Step 4: Name the Parent Chain
The parent chain consists of three carbon atoms (propane) due to the presence of the carboxylic acid. Since it is a carboxylic acid, we will use the suffix "-oic acid". Thus, the parent name is "propanoic acid".

### Step 5: Name the Substituents
The cyano group (-CN) is a substituent and is named as "cyano". Since it is located at position 3, we will prefix the parent name with "3-cyano".

### Step 6: Combine the Names
Combining the substituent name and the parent name gives us the complete IUPAC name:
**3-cyano-propanoic acid**

### Final Answer
The IUPAC name of `NC - CH2CH2 - COOH` is **3-cyano-propanoic acid**.

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