The IUPAC name of `CH_3-underset(CONH_2)underset(|)C=CH-CH_2-underset(OH)underset(|)overset(O)overset(||)C` is

Options

A. 4 - carbamoylpent -3- enoic acid
B. 4 - amido -4- methyl -but -3- enoic acid
C. 3-amido -but-2-enecarboxylic acid
D. 4-carboxy -2-methyl - but -2-enamide

Answer

To determine the IUPAC name of the compound `CH_3-CONH_2|C=CH-CH_2|OH||C`, we will follow a systematic approach based on IUPAC naming conventions.

### Step-by-Step Solution:

1. **Identify the Longest Carbon Chain**:
- The first step is to identify the longest continuous carbon chain that contains the highest priority functional group. In this case, we have a carboxylic acid (–COOH), an amide (–CONH2), a hydroxyl group (–OH), and a double bond (C=C).
- The longest chain consists of 5 carbon atoms.

2. **Number the Carbon Chain**:
- Number the carbon chain starting from the end closest to the highest priority functional group. The carboxylic acid has the highest priority, so we start numbering from that end.
- The numbering will be as follows:
- C1: COOH (carboxylic acid)
- C2: CH (attached to the double bond)
- C3: CH (part of the double bond)
- C4: CH2 (attached to the hydroxyl group)
- C5: CH3 (methyl group)

3. **Identify the Functional Groups**:
- The functional groups present are:
- A carboxylic acid at C1
- A double bond between C2 and C3
- A hydroxyl group at C4
- An amide group at C4 (which will be named as a prefix "carbamoyl").

4. **Construct the Name**:
- The suffix for the carboxylic acid is "oic acid".
- The double bond is indicated by "ene", and its position is indicated by the number of the first carbon involved in the double bond (C2).
- The amide group at C4 will be indicated as "carbamoyl".
- Therefore, the name can be constructed as follows:
- Start with the prefix for the longest chain: "pent" (for 5 carbons).
- Add the position of the double bond: "3-ene".
- Add the prefix for the amide: "4-carbamoyl".
- Finally, add the suffix for the carboxylic acid: "oic acid".

5. **Final IUPAC Name**:
- Combining all these parts, the final IUPAC name of the compound is **4-carbamoyl-3-pentenoic acid**.