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The longest chain with the -OH group has 4 carbons, named butane. The -OH is on the second carbon from the end nearest to it, so it is butan-2-ol.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Physical Properties and Acidity of Alcohols and Phenols
The compound has a 3-carbon chain with -OH groups on carbons 1 and 2, named propane-1,2-diol in IUPAC nomenclature.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Classification and Nomenclature and Structures of Alcohols Phenols Ethers
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
The compound has a 5-carbon chain with the -OH on the second carbon from the end nearest to it, named pentan-2-ol.
Ref: NCERT Class 12 Chemistry > Chapter 7: Alcohols, Phenols and Ethers > Topic: Chemical Reactions of Alcohols - Dehydration Oxidation Esterification
1-Bromo-2,2-dimethylpropane is a three-carbon chain (propane) with two methyl groups on C₂ and Br on C₁: CH₂BrC(CH₃)2CH₃ .
Ref: NCERT Class 12 Chemistry > Chapter 6: Haloalkanes and Haloarenes > Topic: Classification and Nomenclature and Isomerism of Haloalkanes
The compound has a 3-carbon chain with a methyl branch on the second carbon and an -OH on the first, named 2-methylpropan-1-ol.
Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Classification and Nomenclature of Organic Compounds - IUPAC
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