Which of the following statement is wrong -

Options

A. All carbonyl compounds of the general structure `CH_(3)-underset(O)underset(||)(C)-R` give a positive iodoform test
B. All secondary alcohols give iodoform reaction
C. Alkanols of the structure `CH_(3) CH(OH)` - R (where R=H, alkyl or aryl) give iodoform reaction.
D. The only aldehyde giving iodoform reaction is acetaldehyde.

Answer

To determine which statement is wrong regarding Iodoform reactions, let's analyze each statement step by step.

### Step 1: Analyze the first statement
**Statement:** "All carbonyl compounds of the general structure CH3COOR give a positive Iodoform test."

- **Analysis:** The Iodoform test is positive for methyl ketones (compounds with the structure RCOCH3). Since CH3COOR includes a methyl group attached to the carbonyl carbon (C=O), it qualifies as a methyl ketone. Therefore, this statement is **correct**.

### Step 2: Analyze the second statement
**Statement:** "All secondary alcohols give Iodoform reaction."

- **Analysis:** Not all secondary alcohols can give a positive Iodoform reaction. For example, the secondary alcohol CH3CH2CH(OH)CH2CH3 does not have a methyl group adjacent to the carbonyl that would form during oxidation. Therefore, this statement is **wrong**.

### Step 3: Analyze the third statement
**Statement:** "Alkenols of the structure CH3-CHOH where R is equal to H, alkyl, and aryl give Iodoform reaction."

- **Analysis:** This statement is true. If R is H, the compound can oxidize to form acetaldehyde (which gives a positive Iodoform test). If R is an alkyl or aryl group, the compound can also oxidize to form a methyl ketone, which would give a positive Iodoform test as well. Thus, this statement is **correct**.

### Step 4: Analyze the fourth statement
**Statement:** "The only aldehyde giving Iodoform reaction is Acetaldehyde."

- **Analysis:** Acetaldehyde (CH3CHO) is indeed the only aldehyde that gives a positive Iodoform test because it contains the necessary methyl group adjacent to the carbonyl. Other aldehydes do not have this structure. Therefore, this statement is **correct**.

### Conclusion
The only statement that is wrong is the second statement: "All secondary alcohols give Iodoform reaction."

### Final Answer
**The wrong statement is:** "All secondary alcohols give Iodoform reaction."

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