Which of the following `IUPAC` name is/are correct ?

Options

A.
B.
C.
D.

Explanation

To determine which of the given IUPAC names are correct, we need to analyze each name based on the rules of IUPAC nomenclature. Here’s a step-by-step solution:

### Step 1: Analyze the first name - 3-cyanobenzeneamide
- The name suggests a benzene ring with a cyanide group (–C≡N) at the 3rd position and an amide group (–C(=O)NH2).
- According to IUPAC rules, the correct name should reflect the presence of the amide group properly.
- The correct name should be **3-cyanobenzenecarboxamide** instead of 3-cyanobenzeneamide.
- **Conclusion**: This name is incorrect.

**Hint**: Remember that when naming compounds with functional groups, the suffix should accurately reflect the functional group present.

### Step 2: Analyze the second name
- The name suggests a benzene ring with a carbonyl chloride (–C(=O)Cl) group.
- The carbonyl chloride is correctly named as it is a substituent on the benzene ring.
- The name is correct as it follows the IUPAC naming conventions.

**Hint**: Always check if the functional groups are named correctly and placed according to their priority.

### Step 3: Analyze the third name
- The name indicates a phenyl ring with a carboxylate group.
- The priority of the phenyl group is correctly noted, and the carboxylate group is properly represented.
- This name is also correct.

**Hint**: Ensure that the priority of substituents is considered when naming compounds with multiple functional groups.

### Step 4: Analyze the fourth name - 2-chloropropanoic ethanoisine hydride
- This name suggests a propanoic acid derivative with a chloro substituent at the second position and an ethanoisine hydride.
- The chloro substituent is correctly placed, and the name follows IUPAC rules.
- This name is correct.

**Hint**: Verify that the numbering of the carbon chain starts from the end closest to the highest priority functional group.

### Final Conclusion
- The correct IUPAC names are:
- **B**: Correct
- **C**: Correct
- **D**: Correct
- **A**: Incorrect

Thus, the correct answer is **B, C, and D**.