Among the following which statement is incorrect ?

Options

A. `CH_(3)-overset(O)overset(||)C-Ohoverset(X_(2)//OH^(-))rarr` will not respond to haloform test
B. `CH_(2)=cH-CH=Ooverset(overset(o+)((OH))//Delta)rarr` gives cannizaro reaction
C. `Cl-overset(Cl)overset(|)underset(Cl)underset(|)C-CH=Ooverset(overset(o+)(OH)//Delta)rarr ` does not give cannizaro reaction
D.

Answer

To solve the question of identifying the incorrect statement among the given options, we will analyze each statement step by step.

### Step 1: Analyze the First Statement
**Statement:** A carboxylic acid treated with halogens in the presence of a base will not respond to the haloform test.

**Explanation:** The haloform test is specific for compounds that contain a methyl ketone (RCOCH3) or secondary alcohols (RCHOHCH3). Carboxylic acids do not have the structure required to give a positive haloform test. Therefore, this statement is **correct**.

### Step 2: Analyze the Second Statement
**Statement:** An aldehyde treated with a base on heating gives a Cannizzaro reaction.

**Explanation:** The Cannizzaro reaction occurs with aldehydes that do not have alpha hydrogens. The given aldehyde structure (CH2=CH-CHO) has no alpha hydrogen, and thus it will undergo Cannizzaro reaction, producing a primary alcohol and a carboxylic acid. This statement is also **correct**.

### Step 3: Analyze the Third Statement
**Statement:** A compound treated with OH and heat does not give a Cannizzaro reaction.

**Explanation:** The compound in question is Cl3C-CHO. When treated with OH- and heat, it will undergo a Cannizzaro reaction. The presence of the halogen (Cl3C) means that the aldehyde will react, leading to the formation of a carboxylic acid and a primary alcohol. However, the statement claims it does not give a Cannizzaro reaction, which is **incorrect**.

### Step 4: Analyze the Fourth Statement
**Statement:** CH2-benzene-CH2Br treated with aqueous KOH gives a major product as CH2OH.

**Explanation:** When CH2Br is treated with aqueous KOH, the KOH acts as a nucleophile, replacing the bromine atom with a hydroxyl group (OH). Therefore, the product formed will indeed be CH2OH. This statement is **correct**.

### Conclusion
After analyzing all statements, the **incorrect statement** is the third one, which claims that the compound does not give a Cannizzaro reaction when it actually does.

### Final Answer
The incorrect statement is the third one: "This molecule treated with OH and heat does not give a Cannizzaro reaction."

---