IUPAC name of `(C)Cl_(3)CHO` is

Options

A. Chloral
B. Trichloro acetaldehyde
C. 1,1,1- Trichloroethanol
D. 2,2,2- trichloroethanol

Answer

To determine the IUPAC name of the compound \(CCl_3CHO\), we will follow a systematic approach:

### Step-by-Step Solution:

1. **Identify the Functional Group**:
The given compound \(CCl_3CHO\) contains the functional group -CHO, which is characteristic of aldehydes. Therefore, the suffix for the name will be "-al".

**Hint**: Look for the functional group to determine the suffix in the IUPAC name.

2. **Determine the Carbon Chain**:
The carbon chain consists of two carbon atoms. The carbon with the aldehyde group (CHO) is counted as one carbon, and the other carbon is attached to three chlorine atoms (CCl3). This gives us a total of two carbon atoms.

**Hint**: Count the number of carbon atoms in the longest continuous chain that includes the functional group.

3. **Identify Substituents**:
The substituent in this compound is three chlorine atoms attached to the second carbon. In IUPAC nomenclature, we use the prefix "trichloro" to indicate the presence of three chlorine atoms.

**Hint**: Use prefixes (di-, tri-, tetra-, etc.) to indicate the number of identical substituents.

4. **Number the Carbon Chain**:
Number the carbon chain from the end nearest to the aldehyde group. In this case, the aldehyde carbon is carbon 1, and the carbon with the three chlorines is carbon 2.

**Hint**: Always number the chain to give the functional group the lowest possible number.

5. **Combine the Parts**:
Now we combine the substituents and the root name. The root name for two carbon atoms is "eth", and since we have three chlorines on the second carbon, we write "2,2,2-trichloro". The suffix for the aldehyde is "-al".

Therefore, the full IUPAC name is **2,2,2-trichloroethanal**.

6. **Common Name**:
It is also worth noting that the common name for this compound is **trichloroacetaldehyde** (also known as "chloral").

**Hint**: Remember that some compounds have common names that may differ from their IUPAC names.

### Final Answer:
The IUPAC name of \(CCl_3CHO\) is **2,2,2-trichloroethanal**.