Cyclohexanone on being heated with NaOH solution forms.

Options

A.
B.
C.
D.

Answer

To solve the question regarding the reaction of cyclohexanone when heated with NaOH solution, we can follow these steps:

### Step 1: Identify the Reactant
Cyclohexanone is a ketone with the formula C6H10O. It has alpha hydrogens, which are hydrogen atoms attached to the carbon atoms adjacent to the carbonyl group (C=O).

**Hint:** Look for the functional groups in the compound to identify alpha hydrogens.

### Step 2: Reaction with NaOH
When cyclohexanone is heated with NaOH, it undergoes aldol condensation. This reaction requires two moles of cyclohexanone because the aldol condensation involves the formation of a carbon anion from one molecule that will then react with another molecule.

**Hint:** Remember that aldol condensation requires a strong base and the presence of alpha hydrogens.

### Step 3: Formation of the Carbon Anion
In the first step, one of the alpha hydrogens from the first mole of cyclohexanone is removed by NaOH, resulting in the formation of a carbon anion. The structure will still retain the carbonyl (C=O) group.

**Hint:** The removal of an alpha hydrogen creates a nucleophile (the carbon anion).

### Step 4: Nucleophilic Attack
The carbon anion formed in the previous step will attack the carbonyl carbon of the second mole of cyclohexanone. This results in the formation of a new intermediate compound.

**Hint:** Look for how nucleophiles react with electrophiles in organic reactions.

### Step 5: Protonation
After the nucleophilic attack, the negatively charged oxygen (O-) from the carbonyl group will pick up a proton (H+) from the medium, resulting in the formation of a hydroxyl group (-OH) on the new compound.

**Hint:** Protonation is a common step in reactions involving nucleophiles and electrophiles.

### Step 6: Dehydration
Upon heating, the intermediate compound will undergo dehydration, where a water molecule is eliminated. This results in the formation of a double bond between the two carbons that were involved in the reaction.

**Hint:** Dehydration typically occurs in aldol condensation reactions to form an alkene.

### Step 7: Final Product
The final product of this reaction is an α,β-unsaturated ketone, specifically 2-cyclohexenone, which retains the ketone functional group and has a double bond.

**Hint:** Check the structure of the final product to ensure it matches the expected outcome of the aldol condensation.

### Conclusion
Thus, the final product formed when cyclohexanone is heated with NaOH is 2-cyclohexenone.

**Final Answer:** 2-Cyclohexenone