IUPAC name of `C Cl_3CHO` is

Options

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

Explanation

To determine the IUPAC name of the compound CCl3CHO, follow these steps:

### Step 1: Identify the Functional Group
The compound CCl3CHO contains the functional group -CHO, which is characteristic of aldehydes. Aldehydes have the highest priority in naming.

**Hint:** Look for the functional group with the highest priority when naming organic compounds.

### Step 2: Count the Carbon Atoms
The structure of CCl3CHO can be represented as:
- A carbon atom (C) connected to three chlorine atoms (Cl) and one carbonyl group (C=O) with a hydrogen atom (H) attached to the carbonyl carbon.

This gives us a total of 2 carbon atoms in the longest carbon chain.

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

### Step 3: Number the Carbon Chain
Number the carbon chain starting from the carbon of the aldehyde group (the -CHO end). This means:
- The carbon with the -CHO group is carbon 1.
- The carbon connected to the three chlorine atoms is carbon 2.

**Hint:** Always number the chain from the end nearest to the functional group.

### Step 4: Identify Substituents
The substituent on carbon 2 is three chlorine atoms (CCl3). In IUPAC nomenclature, this is referred to as "trichloro."

**Hint:** Identify and name any substituents based on their positions on the carbon chain.

### Step 5: Combine the Names
The full name combines the substituent name with the base name of the aldehyde. The base name for a 2-carbon aldehyde is "ethanal." Therefore, the complete name is:
- 2,2,2-trichloroethanal.

**Hint:** Combine the substituent names with the base name, ensuring to use the correct order and punctuation.

### Final Answer
The IUPAC name of CCl3CHO is **2,2,2-trichloroethanal**.

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