Alcohol phenol and ether part 2
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NCERT Class 12 Chemistry Chapter-wise Solutions
- 1 – The Solid State
- 2 – Solutions
- 3 – Electrochemistry
- 4 – Chemical Kinetics
- 5 – Surface Chemistry
- 6 – General Principles and Processes of Isolation of Elements
- 7 – The p-Block Elements
- 8 – The d-and f-Blocks Elements
- 9 – Coordination Compounds
- 10 – Haloalkanes and Haloarenes
- 11 – Alcohols, Phenols and Ethers
- 12 – Aldehydes, Ketones and Carboxylic Acids
- 13 – Amines
- 14 – Biomolecules
- 15 – Polymers
- 16 – Chemistry in Everyday Life
CHAPTER ELEVEN ALCOHOLS, PHENOLS AND ETHERS
- 11.1 Classification
- 11.2 Nomenclature
- 11.3 Structures of Functional Groups
- 11.4 Alcohols and Phenols
- 11.5 Some Commerically Important Alcohols
- 11.6 Ethers
NCERT Solutions class 12 Chemistry alcohol phenol and ether part 2
17. Give equations of the following reactions:
(i) Oxidation of propan-1-ol with alkaline 
solution.
(ii) Bromine in 
with phenol.
(iii) Dilute 
with phenol.
(iv) Treating phenol with chloroform in presence of aqueous NaOH.
18. Explain the following with an example.
(i) Kolbe’s reaction.
(ii) Reimer-Tiemann reaction.
(iii) Williamson ether synthesis.
(iv) Unsymmetrical ether.
19. Write the mechanism of acid-catalysed dehydration of ethanol to yield ethene.
20. How are the following conversions carried out?
(i) Propene → Propan-2-ol
(ii) Benzyl chloride → Benzyl alcohol
(iii) Ethyl magnesium chloride → Propan-1-ol.
(iv) Methyl magnesium bromide → 2-Methylpropan-2-ol.
21. Name the reagents used in the following reactions:
(i) Oxidation of a primary alcohol to carboxylic acid.
(ii) Oxidation of a primary alcohol to aldehyde.
(iii) Bromination of phenol to 2,4,6-tribromophenol.
(iv) Benzyl alcohol to benzoic acid.
(v) Dehydration of propan-2-ol to propene.
(vi) Butan-2-one to butan-2-ol.
22. Give reason for the higher boiling point of ethanol in comparison to methoxymethane.
23. Give IUPAC names of the following ethers:
(i)
(ii)
(iii)
(iv)
(v)
(vi)
24. Write the names of reagents and equations for the preparation of the following ethers by Williamson’s synthesis:
(i) 1-Propoxypropane
(ii) Ethoxybenzene
(iii) 2-Methoxy-2-methylpropane
(iv) 1-Methoxyethane
25. Illustrate with examples the limitations of Williamson synthesis for the preparation of certain types of ethers.
26. How is 1-propoxypropane synthesised from propan-1-ol? Write mechanism of this reaction.
27. Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method. Give reason.
28. Write the equation of the reaction of hydrogen iodide with:
(i) 1-propoxypropane
(ii) Methoxybenzene and
(iii) Benzyl ethyl ether
29. Explain the fact that in aryl alkyl ethers
(i) The alkoxy group activates the benzene ring towards electrophilic substitution and
(ii) It directs the incoming substituents to ortho and para positions in benzene ring.
30. Write the mechanism of the reaction of HI with methoxymethane.
31. Write equations of the following reactions:
(i) Friedel-Crafts reaction-alkylation of anisole.
(ii) Nitration of anisole.
(iii) Bromination of anisole in ethanoic acid medium.
(iv) Friedel-Craft’s acetylation of anisole.
32. Show how would you synthesise the following alcohols from appropriate alkenes?
(i)
(ii)
(iii)
(iv)
33. When 3-methylbutan-2-ol is treated with HBr, the following reaction takes place:
Give a mechanism for this reaction. (Hint: The secondary carbocation formed in step II rearranges to a more stable tertiary carbocation by a hydride ion shift from 3rd carbon atom.
covers both organic and inorganic chemistry. Please note that CBSE has reduced the syllabus for class 12 Chemistry. So, you must check the latest syllabus of CBSE while going through the NCERT solution of any chapter given in the class 12 NCERT book.