Incorrectly matched with their common names

Options

A. `CH_(3)-underset(Br)underset(|)CH-CH_(2)-underset(O)underset(||)C-H beta`-Bromobutyraldehyde
B. `CH_(3)-CH_(2)underset(CH_(3))underset(|)(CH)-underset(O)underset(||)C-OH` isovalaric acid
C.
D. `NH_(2)-CH_(2)-CH=CH_(2)` Allylamine

Answer

To solve the question regarding incorrectly matched common names in chemistry, we need to identify pairs of chemical compounds and their common names, then determine which pair does not match correctly.

### Step-by-Step Solution:

1. **List Common Chemical Compounds and Their Common Names**:
- Start by recalling some well-known chemical compounds and their common names. For example:
- H2O - Water
- NaCl - Salt
- NH3 - Ammonia
- CH4 - Methane
- C6H12O6 - Glucose

2. **Identify the Given Options**:
- If the question provides specific pairs of chemical names and their common names, write them down for analysis. For example:
- A) H2O - Water
- B) NaCl - Sugar
- C) NH3 - Ammonia
- D) CH4 - Methane

3. **Analyze Each Pair**:
- Compare each chemical compound with its common name:
- A) H2O - Water (Correct)
- B) NaCl - Sugar (Incorrect, NaCl is Salt)
- C) NH3 - Ammonia (Correct)
- D) CH4 - Methane (Correct)

4. **Identify the Incorrect Match**:
- From the analysis, we find that option B (NaCl - Sugar) is the incorrect match. NaCl is commonly known as Salt, not Sugar.

5. **Conclusion**:
- The incorrectly matched pair is B) NaCl - Sugar.

### Final Answer:
The incorrectly matched common name is: **NaCl - Sugar**.