The IUPAC name of `CH_(3)CHO` is :

Options

A. Acetaldehyde
B. Methylaldehyde
C. Formyl chloride
D. Ethanal

Answer

To determine the IUPAC name of the compound `CH3CHO`, follow these steps:

### Step 1: Identify the structure of the compound
The compound `CH3CHO` can be represented as:
- CH3 (methyl group)
- C=O (carbonyl group)
- H (hydrogen)

This indicates that we have a carbon chain with a carbonyl group at the end, which is characteristic of aldehydes.

**Hint:** Look for the functional group present in the compound to identify its class.

### Step 2: Determine the longest carbon chain
In this case, the longest carbon chain consists of 2 carbon atoms:
- The first carbon (C1) is part of the CH3 group.
- The second carbon (C2) is part of the CHO group.

**Hint:** Count the number of carbon atoms in the longest continuous chain.

### Step 3: Number the carbon chain
Number the carbon chain starting from the end closest to the functional group (the aldehyde group). Here, we start from the CHO end:
- C1: CHO (aldehyde)
- C2: CH3

This gives us:
1. C1: Aldehyde group
2. C2: Methyl group

**Hint:** Always number the chain from the end nearest to the functional group to give it the lowest possible number.

### Step 4: Identify the functional group
The functional group present is the aldehyde group (-CHO). Aldehydes are characterized by the presence of the carbonyl group (C=O) at the end of the carbon chain.

**Hint:** Recognize the functional group to determine the suffix for the name.

### Step 5: Assign the IUPAC name
Since there are 2 carbon atoms in the longest chain and the functional group is an aldehyde, the root name will be derived from "ethane" (for 2 carbons). The suffix for aldehydes is "-al". Therefore, the IUPAC name is "ethanal".

**Hint:** Combine the root name with the appropriate suffix based on the functional group.

### Final Answer:
The IUPAC name of `CH3CHO` is **ethanal**.