The incorrect statement for aldehydes and ketones is

Options

A. Methanal, ethanal and propanone are miscible in water
B. All aldehydes and ketones are fairly soluble in organic solvents like benzene, chloroform, etc.
C. Many naturally occurring aldehyde and ketones are used in the blending of perfumes
D. All aldehydes and ketones are fragrant

Answer

To determine the incorrect statement regarding aldehydes and ketones, we will analyze each statement provided.

### Step-by-Step Solution:

1. **Analyze Statement 1:**
- Statement: Methanol, ethanol, and propanol are miscible in water.
- Explanation: Lower aldehydes and ketones (like methanol, ethanol, and propanol) are indeed miscible in water due to the ability to form hydrogen bonds with water molecules. Therefore, this statement is **correct**.

2. **Analyze Statement 2:**
- Statement: All aldehydes and ketones are fairly soluble in organic solvents.
- Explanation: It is true that both lower and higher aldehydes and ketones are soluble in organic solvents like benzene, ether, and chloroform. However, the solubility in water decreases with increasing molecular weight. This statement is also **correct**.

3. **Analyze Statement 3:**
- Statement: Many naturally occurring aldehydes and ketones are used in blending of perfumes.
- Explanation: This is accurate as many aldehydes and ketones, such as vanillin (from vanilla), are used in perfumes for their pleasant fragrances. Thus, this statement is **correct**.

4. **Analyze Statement 4:**
- Statement: All aldehydes and ketones are fragrant.
- Explanation: This statement is incorrect. While lower aldehydes often have a pungent odor, higher aldehydes and ketones can have less pungent or even bland odors. Therefore, not all aldehydes and ketones are fragrant. This statement is **incorrect**.

### Conclusion:
The incorrect statement is **Statement 4**: "All aldehydes and ketones are fragrant."

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