Ch 11Alcohols, Phenols and Ethers — Class 12 Chemistry, concept-first.

Alcohols are organic compounds whose molecules carry a hydroxyl group, -OH, attached to a saturated (sp3-hybridised) carbon atom.

Alcohols, phenols and ethers are each classified along their own set of criteria, developed in the two sub-sections that follow.

Monohydric, dihydric, trihydric and polyhydric compounds are alcohols/phenols bearing one, two, three, or more -OH groups respectively in their molecule: ethanol (CH3-CH2-OH) is monohydric, ethylene g…

Ethers are classified as symmetrical ethers (also called simple ethers) when the two alkyl or aryl groups bonded to the central oxygen atom are identical -- for example CH3-O-CH3 (dimethyl ether) or C…

Three separate, parallel systems exist for naming alcohols, phenols and ethers, and each is developed in its own sub-section below.

Monohydric alcohols are named by three parallel systems. Common/trivial names are formed by adding the word 'alcohol' after the name of the alkyl group that is bonded to -OH (e.g.

The hydroxyl derivative of benzene -- a benzene ring bearing a single -OH group -- is universally called phenol; its fully systematic IUPAC name is benzenol, though the common, shorter name 'phenol' i…

In the common (trivial) system of nomenclature, an ether is named by first writing the names of the two alkyl (or aryl) groups bonded to its oxygen atom in strict alphabetical order, and then adding t…

Having covered classification and nomenclature, the chapter now turns to the substantive chemistry of alcohols and phenols together, organised into three parts taken up in the sections that follow: ho…

Alcohols can be prepared by five general routes. (a) Hydrolysis of an alkyl halide with aqueous alkali or moist silver oxide gives the corresponding alcohol directly (this route is covered in more mec…

Phenol can be prepared by four distinct routes. (a) The Dow process starts from chlorobenzene, which is fused with NaOH under forcing conditions (623 K and 300 atm) to displace the ring chlorine and g…

Alcohols and phenols are strongly polar molecules because of their -OH group, and this polarity manifests as extensive intermolecular hydrogen bonding, in which the -OH's delta-positive hydrogen on on…

This section develops the full chemistry of the O-H and C-O bonds in alcohols, and the characteristic ring chemistry of phenols, across four groups of reactions.

The chapter's final major topic is ethers, developed across the three sections that follow: how ethers are prepared (section 11.5.1), their physical properties (11.5.2), and their chemical properties…

Ethers can be made by two general routes. The first is acid-catalysed dehydration of an alcohol using a dehydrating agent such as concentrated H2SO4 or H3PO4, where the SAME alcohol can give EITHER an…

Ethers' physical state and boiling points follow a clear pattern by size: the two smallest ethers, dimethyl ether and ethyl methyl ether, are gases at room temperature, while all larger ethers are col…

Ethers are largely, though not entirely, chemically unreactive. As a laboratory test, ethers do not react with bases, cold dilute acids, reducing agents, oxidising agents, or active metals -- but they…

Each of the three families covered in this chapter has genuine everyday and industrial uses. Among the alcohols, methyl alcohol (methanol) is used as a solvent for paints and varnishes, while ethyl al…

The end-of-chapter questions of this group, exactly as the book prints them.

The end-of-chapter questions of this group, exactly as the book prints them.

The end-of-chapter questions of this group, exactly as the book prints them.

The end-of-chapter questions of this group, exactly as the book prints them. (The book prints this group with a bare number and no heading.)

The end-of-chapter questions of this group, exactly as the book prints them.

The end-of-chapter questions of this group, exactly as the book prints them.

The end-of-chapter questions of this group, exactly as the book prints them.

Sample papers and previous-year board questions for this subject.