Alcohols Phenols and Ethers — Class 12 Chemistry NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 12 Chemistry chapter "Alcohols Phenols and Ethers" — 8 important questions with detailed answers for CBSE board exam preparation.
TL;DR: Free step-by-step NCERT solutions for Class 12 Chemistry chapter "Alcohols Phenols and Ethers" — 8 important questions with detailed answers for CBSE…
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Key Questions Covered:
- What is the difference between an alcohol and a phenol? Give structural formu…
- Explain why phenols are more acidic than alcohols. Write the equation for the…
- Write the equation for the reaction of phenol with bromine water. What is the…
- + 5 more questions in the full chapter
Solutions Summary:
| Question | Status |
|---|---|
| What is the difference between an alcohol and a phenol? G… | ✓ Solved |
| Explain why phenols are more acidic than alcohols. Write … | ✓ Solved |
| Write the equation for the reaction of phenol with bromin… | ✓ Solved |
Showing 3 of 8 questions
Q1: What is the difference between an alcohol and a phenol? Give structural formulas and one example of each.
Alcohol: A compound with an -OH group bonded to an sp3 hybridized carbon atom (aliphatic carbon).
Example: CH3CH2OH (ethanol, alcohol)
Structural formula: R-OH where R is an alkyl group
Phenol: A compound with an -OH group bonded directly to an aromatic benzene ring (sp2 hybridized carbon).
Example...
Q2: Explain why phenols are more acidic than alcohols. Write the equation for the ionization of phenol in water.
Ionization equation:
C6H5OH ⇌ C6H5O- + H+
Ka = 1.3 × 10^-10 (pKa ≈ 10)
Why phenols are more acidic than alcohols:
1. Resonance stabilization of phenoxide ion (C6H5O-):
The negative charge on the oxygen is delocalized into the aromatic ring through resonance. The electron-rich aromatic ring can acc...
Q3: Write the equation for the reaction of phenol with bromine water. What is the product, and why is this reaction so vigorous?
Reaction equation:
C6H5OH + 3 Br2 → C(Br)3 C(Br)3... (Actually forms 2,4,6-tribromophenol)
Correct equation:
C6H5OH + 3 Br2 (in H2O) → 2,4,6-C6H2(OH)(Br)3 + 3 HBr
Product: 2,4,6-tribromophenol (white precipitate)
Why is this reaction so vigorous?
1. High reactivity of the benzene ring:
The -OH gr...
Showing 3 of 8 questions. Visit the full page for complete solutions.