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Which of the following will give iodofor...

Which of the following will give iodoform test?

A

3-Pentanone

B

Formaldehyde

C

Butanone

D

Benzylalcohol

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the given compounds will give a positive iodoform test, we need to analyze each compound based on the criteria for the iodoform test. The iodoform test is positive for compounds that contain a methyl ketone group (C=O with a CH3 group) or for certain secondary alcohols that can be oxidized to form a methyl ketone. ### Step-by-Step Solution: 1. **Identify the Compounds:** - The compounds given are: 1. 3-Pentanone 2. Formaldehyde 3. Butanone 4. Benzyl alcohol 2. **Analyze Each Compound:** - **3-Pentanone (C5H10O):** - Structure: CH3-CH2-CO-CH2-CH3 - This compound has a ketone functional group, but it is not a methyl ketone (the ketone is not attached to a CH3 group). Therefore, it will not give a positive iodoform test. - **Formaldehyde (HCHO):** - Structure: HCHO - Formaldehyde is an aldehyde and does not contain a methyl ketone group. Thus, it will not give a positive iodoform test. - **Butanone (C4H8O):** - Structure: CH3-CO-CH2-CH3 - This compound has a methyl ketone group (C=O with a CH3 group). Therefore, it will give a positive iodoform test. - **Benzyl Alcohol (C7H8O):** - Structure: C6H5-CH2OH - Benzyl alcohol is a primary alcohol. When oxidized, it would convert to benzaldehyde (C6H5CHO), which does not have a methyl ketone structure. Therefore, it will not give a positive iodoform test. 3. **Conclusion:** - The only compound that will give a positive iodoform test is **Butanone (option 3)**. ### Final Answer: **Butanone will give a positive iodoform test.** ---
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