Which of the following is/are incorrect IUPAC name.

Options

A. `4`-Chloro-`3`-methyl cyclopentanol-1
B. `1`-Amino-`3`-bromohexan-`1`-one
C. `4`-chloro-`3`-methylcyclohexane carboxylic acid
D. `3`-Bromo-`1`- methylhexan-`1`-ol

Answer

To determine which of the given IUPAC names are incorrect, we will analyze each name step by step based on the rules of IUPAC nomenclature.

### Step 1: Analyze the first name: 4-chloro-3-methyl-cyclopentano-1
1. Identify the substituents: Here, we have chloro (Cl) and methyl (CH₃) as substituents.
2. Check the order: According to IUPAC rules, substituents should be listed in alphabetical order. "Chloro" comes before "methyl," so the order is correct.
3. Analyze the suffix: The suffix "cyclopentano-1" seems to indicate a cyclopentane structure, but it is incorrectly formatted. The correct format should be "cyclopentan-1-ol" or "cyclopentan-1-one" depending on the functional group.
4. Conclusion: The position of the substituent should come before the suffix, making this name incorrect.

### Step 2: Analyze the second name: 1-amino-3-bromo-hexane-1-one
1. Identify the substituents: We have amino (NH₂) and bromo (Br) as substituents.
2. Check the order: "Amino" comes before "bromo" in alphabetical order, which is correct.
3. Analyze the suffix: The suffix "hexane-1-one" indicates a ketone, which is correctly placed.
4. Conclusion: This name is correct.

### Step 3: Analyze the third name: 4-chloro-3-methyl-cyclohexane carboxylic acid
1. Identify the substituents: Chloro and methyl are the substituents.
2. Check the order: The order is correct as "chloro" comes before "methyl."
3. Analyze the suffix: The name ends with "carboxylic acid," which is not the correct IUPAC format. The correct suffix for carboxylic acids should be "oic acid."
4. Conclusion: This name is incorrect because it uses the wrong suffix.

### Step 4: Analyze the fourth name: 3-bromo-1-methylhexane-1-ol
1. Identify the substituents: Bromo and methyl are the substituents.
2. Check the order: "Bromo" comes before "methyl," which is correct.
3. Analyze the suffix: The suffix "hexane-1-ol" indicates an alcohol, which is correctly placed.
4. Conclusion: This name is correct.

### Final Conclusion
The incorrect IUPAC names are:
1. 4-chloro-3-methyl-cyclopentano-1 (incorrect format and order)
2. 4-chloro-3-methyl-cyclohexane carboxylic acid (incorrect suffix)

Thus, the answer is that options 1 and 3 are incorrect IUPAC names.

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