Which of the following statements `is//are` wrong?

Options

A. Acetic acid is the systematic name of vinegar.
B. `Me-overset(O)overset(||)(C )-OH` is an unsaturated compound.
C. Prefixes like n-,iso, sec-,tert,neo-,etc., are used in `IUPAC` system.
D. The systematic names of acids are formed by dropping-e of the name of parent alkane and adding -oic acid.

Explanation

To determine which statements are wrong, we need to analyze each statement provided in the question.

### Step-by-Step Solution:

1. **Evaluate Statement 1**: "Acetic acid is a systematic name of vinegar."
- **Analysis**: Acetic acid is the common name for the compound CH₃COOH, while vinegar is a diluted solution of acetic acid. The systematic (IUPAC) name for acetic acid is ethanoic acid. Therefore, this statement is incorrect.
- **Conclusion**: Statement 1 is wrong.

2. **Evaluate Statement 2**: "MeC double bond O, OH is an unsaturated compound."
- **Analysis**: The structure mentioned (MeC=O, OH) indicates the presence of a double bond (C=O) along with an OH group. Compounds with double bonds (C=C or C=O) are considered unsaturated. Thus, this statement is correct.
- **Conclusion**: Statement 2 is correct.

3. **Evaluate Statement 3**: "Prefixes like N, iso, sect, tertiary, neo, etc., are used in..."
- **Analysis**: These prefixes are indeed used in common naming conventions rather than systematic (IUPAC) naming. For example, isobutane is a common name, while 2-methylbutane is the IUPAC name. Therefore, this statement is incorrect.
- **Conclusion**: Statement 3 is wrong.

4. **Evaluate Statement 4**: "Systematic names of acids are formed by dropping E of the name of parent alkane and adding oic acid."
- **Analysis**: This is a correct statement. For example, ethane (C₂H₆) becomes ethanoic acid (CH₃COOH) by dropping the 'e' and adding 'oic acid'.
- **Conclusion**: Statement 4 is correct.

### Final Answer:
The wrong statements are **Statement 1** and **Statement 3**.

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