The functional group Aldehdye is a

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Answer

To determine the functional group of an aldehyde, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Functional Group**: The functional group of an aldehyde is characterized by the presence of a carbonyl group (C=O) bonded to a hydrogen atom (H). This can be represented as -CHO.

2. **Write the Structural Formula**: The structural formula for the aldehyde functional group can be expressed as:
\[ \text{C} \text{(double bond)} \text{O} \text{(single bond)} \text{H} \]
This indicates that the carbon atom is double-bonded to an oxygen atom and single-bonded to a hydrogen atom.

3. **Understand the Attachment**: The aldehyde group (-CHO) can be attached to an alkyl group (R), which can be any carbon-containing group. This means that the general formula for an aldehyde can be represented as R-CHO, where R can be any hydrocarbon chain.

4. **Differentiate from Other Functional Groups**: It is important to differentiate the aldehyde functional group from other functional groups:
- The carboxylic acid functional group has the formula -COOH.
- The alcohol functional group has the formula -OH.
- Ketones have the carbonyl group (C=O) but are not attached to a terminal hydrogen.

5. **Conclusion**: Therefore, the functional group of an aldehyde is correctly identified as -CHO.