Which is not correct

Options

A. Phenol is more acidic than acetic acid
B. Ethanol is less acidic than phenol
C. Ethanol has lower boiling point than ethane
D. Ethyne is a non-linear molecules

Explanation

To determine which statement is not correct regarding the acidity and properties of phenol, acetic acid, ethanol, and ethane, let’s analyze each option step by step.

### Step 1: Analyze the acidity of phenol and acetic acid
- **Statement**: "Phenol is more acidic than acetic acid."
- **Explanation**: Phenol (C6H5OH) is indeed more acidic than acetic acid (CH3COOH). This is because the phenoxide ion (C6H5O-) formed when phenol loses a proton is stabilized by resonance. In contrast, the acetate ion (CH3COO-) formed from acetic acid is also stabilized, but not to the same extent as the phenoxide ion. Therefore, this statement is **correct**.

### Step 2: Analyze the acidity of ethanol compared to phenol
- **Statement**: "Ethanol is less acidic than phenol."
- **Explanation**: Ethanol (C2H5OH) is less acidic than phenol. The conjugate base of ethanol (C2H5O-) is less stable than that of phenol due to the lack of resonance stabilization. Therefore, this statement is **correct**.

### Step 3: Compare the boiling points of ethanol and ethane
- **Statement**: "Ethanol has a lower boiling point than ethane."
- **Explanation**: Ethanol (C2H5OH) has a higher boiling point than ethane (C2H6) due to the presence of intermolecular hydrogen bonding in ethanol, which requires more energy to break during boiling. Ethane, being a non-polar molecule, does not exhibit hydrogen bonding and thus has a lower boiling point. Therefore, this statement is **not correct**.

### Conclusion
The statement "Ethanol has a lower boiling point than ethane" is the incorrect option.

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