24 public questions tagged with this topic.
Kolbe’s reaction involves the reaction of sodium phenoxide with CO ₂ to introduce an -OH group at the ortho position. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.
Phenols give a violet coloration with neutral FeCl ₃, which is a characteristic test for their presence. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.
Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII), Chapter: Coordination Compounds and d Block Elements (Latest NCERT 2026-27), Topic: Colour of [Ti(H₂O)₆]³⁺, crystal field theory and d-d transition
Phenol reacts with bromine water to form 2, 4, 6-tribromophenol, which precipitates as a white solid. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.
Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.
Phenol reacts with dilute HNO₃ to form a mixture of 2-nitrophenol and 4-nitrophenol, with 2-nitrophenol being a significant product due to ortho-para directing effect of -OH.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Preparation of Phenols and Ethers - Williamson and Other Methods
Phenol (C₆H₅OH) reacts with Na to form sodium phenoxide (C₆H₅ONa) and H₂ gas, showcasing its acidic nature.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Preparation of Phenols and Ethers - Williamson and Other Methods
Phenol is more acidic due to resonance stabilization of the phenoxide ion, allowing it to form a soluble salt with NaOH, unlike ethanol, which is a weaker acid.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Physical Properties and Acidity of Alcohols and Phenols
The -OH group donates electrons to the benzene ring via resonance, increasing electron density at ortho and para positions, thus activating it for electrophilic substitution.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Physical Properties and Acidity of Alcohols and Phenols
Phenol (C₆H₅OH) reacts with sodium metal to form sodium phenoxide (C₆H₅ONa) and hydrogen gas, showcasing its acidic nature.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Physical Properties and Acidity of Alcohols and Phenols
Phenol reacts with NaOH to form sodium phenoxide (C₆H₅ONa) and water, indicating its acidic nature due to the stabilization of the phenoxide ion by resonance.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Classification and Nomenclature and Structures of Alcohols Phenols Ethers
Phenol reacts with dilute HNO₃ to form a mixture of o-nitrophenol and p-nitrophenol due to the ortho-para directing effect of the -OH group.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Classification and Nomenclature and Structures of Alcohols Phenols Ethers
Phenol (C₆H₅OH) reacts with Na to form sodium phenoxide and releases hydrogen gas (H₂), indicating its acidic nature.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Classification and Nomenclature and Structures of Alcohols Phenols Ethers
Phenol reacts with conc. HNO₃ to form 2,4,6-trinitrophenol (picric acid) due to the strong activation of the ring by the -OH group, allowing trisubstitution.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Classification and Nomenclature and Structures of Alcohols Phenols Ethers
