Latest questions in this category.
The longest chain is propane with two methyl groups on the second carbon, where the -OH is attached, named 2-methylpropan-2-ol.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Chemical Reactions of Phenols and Ethers and Uses
Pentan-1-ol (CH₃(CH₂)3CH₂OH), a primary alcohol, is oxidized to pentanoic acid (CH₃(CH₂)3COOH) using a strong oxidizing agent like KMnO₄.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Chemical Reactions of Phenols and Ethers and Uses
Propan-2-ol (CH₃CH(OH)CH₃), commonly known as isopropyl alcohol, is widely used as a disinfectant due to its antiseptic properties.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Chemical Reactions of Phenols and Ethers and Uses
Butan-2-ol (CH₃CH(OH)CH₂CH₃), a secondary alcohol, is oxidized to butan-2-one (CH₃COCH₂CH₃) with PCC.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Chemical Reactions of Phenols and Ethers and Uses
Pentane-2,4-diol (CH₃-CH(OH)-CH₂-CH(OH)-CH₃) has a 5-carbon chain, as counted from one end to the other: CH₃-CH-CH₂-CH-CH₃.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Chemical Reactions of Phenols and Ethers and Uses
Propyl magnesium bromide (CH₃CH₂CH₂MgBr) reacts with formaldehyde (HCHO), adding the propyl group to the carbonyl, yielding butan-1-ol (CH₃CH₂CH₂CH₂OH) after hydrolysis.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Chemical Reactions of Phenols and Ethers and Uses
In Kolbe’s reaction, phenol reacts with CO₂ and NaOH under heat and pressure, followed by acidification, to form salicylic acid.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Chemical Reactions of Phenols and Ethers and Uses
2-Methylpropan-2-ol ((CH₃)3COH), a tertiary alcohol, does not oxidize with KMnO₄ due to the absence of an alpha hydrogen, so it remains unchanged.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Chemical Reactions of Phenols and Ethers and Uses
In Kolbe’s reaction, phenol reacts with CO₂ under basic conditions followed by acidification to form salicylic acid (2-hydroxybenzoic acid).
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Chemical Reactions of Phenols and Ethers and Uses
In a non-polar solvent like CS₂, phenol undergoes controlled monobromination to form a mixture of o-bromophenol and p-bromophenol, with the para isomer being the major product.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Chemical Reactions of Phenols and Ethers and Uses
Pentan-3-ol (CH₃CH₂CH(OH)CH₂CH₃) dehydrates to pent-2-ene (CH₃CH=CHCH₂CH₃) as the major product with conc. H₂SO₄, following Saytzeff’s rule.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Chemical Reactions of Phenols and Ethers and Uses
Phenol reacts with Br₂ in water to form 2,4,6-tribromophenol due to the strong activation of the ring by the -OH group, leading to trisubstitution.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Chemical Reactions of Phenols and Ethers and Uses
