Which `IUPAC` name is incorrect among the following compounds?

Options

A. `CH_(3)-CH=CH-CH_(2)-CI , 1`-Chlorobut-`2`-eye
B. `HC-=C=CH_(2)-CH_(2)-Br , 1`-Bromobut-`3`-yne
C. `CH_(3)-CH=CH-CH=CH_(2)` , Penta-`1,3`-diene
D. `CH_(3)-oversetoverset(Br)(|)(CH)-CH_(2)-undersetunderset(Cl)(|)oversetoverset(Cl)(|)(C)-CH_(3) , 4`-Bromo-`2,2`-dichloropentane

Answer

To determine which IUPAC name is incorrect among the given compounds, let's analyze each option step by step.

### Step 1: Analyze Option A - 1-chlorobut-2-ene
1. **Structure**: The compound has a 4-carbon chain (but) with a double bond between the 2nd and 3rd carbon atoms (2-ene).
2. **Chlorine Substitution**: The chlorine atom is attached to the first carbon.
3. **Correctness**: The structure corresponds to the name, so this option is correct.

### Step 2: Analyze Option B - 1-bromobut-3-yne
1. **Structure**: The compound has a 4-carbon chain (but) with a triple bond between the 3rd and 4th carbon atoms (3-yne).
2. **Bromine Substitution**: The bromine atom is attached to the first carbon.
3. **Correctness**: The correct IUPAC name for this structure should be 1-bromo-3-butyne, not 1-bromobut-3-yne. Therefore, this option is incorrect.

### Step 3: Analyze Option C - Penta-1,3-diene
1. **Structure**: The compound has a 5-carbon chain (penta) with double bonds between the 1st and 2nd carbon, and the 3rd and 4th carbon (1,3-diene).
2. **Correctness**: The structure corresponds to the name, so this option is correct.

### Step 4: Analyze Option D - 4-bromobut-2,2-dichloropentane
1. **Structure**: The compound has a 5-carbon chain (pentane) with two chlorine atoms on the 2nd carbon and a bromine atom on the 4th carbon.
2. **Correctness**: The structure corresponds to the name, so this option is correct.

### Conclusion
After analyzing all options, the incorrect IUPAC name is found in **Option B - 1-bromobut-3-yne**.

### Final Answer
The incorrect IUPAC name among the given compounds is **Option B - 1-bromobut-3-yne**.

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