NCERT Solutions For Class 12 Chemistry Chapter 11: Alcohols, Phenols and Ethers

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NCERT Solutions for Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers deals with Alcohols and phenols that are formed when a hydrogen atom in a hydrocarbon, aliphatic and aromatic respectively, is replaced by –OH group. The important topics in Alcohols, Phenols and Ethers chapter include:

Expected no.of questions: 2 to 3 questions of total 6 marks

Download PDF: NCERT Solutions for Class 12 Chemistry Chapter 11 pdf

NCERT Solutions for Class 12 Chemistry Chapter 11

The NCERT Solutions for class 12 Chemistry chapter 11 are as given below.

Class 12 Chemistry Chapter 11 Alcohols, Phenols & Ethers – Important Topics

Alcohol: Compound where one or more hydroxyl group [OH] is directly attached to the carbon atom of an aliphatic system.

Classified into Mohohydric alcohols, Dihydric alcohols and Triydric alcohols depending on the number of hydroxyl groups.
Also classified into Primary alcohol, Secondary alcohol and Tertiary alcohol based on carbon atom bonded to the hydroxyl group.

Phenols: Compound where one or more hydroxyl group [OH] is directly attached to the carbon atom of an aromatic system.

Classified into Mohohydric phenols, Dihydric phenols and Triydric phenols depending on the number of hydroxyl groups.

Ethers: Compound formed when a hydrogen atom in a hydrocarbon is substituted by an alkoxy or aryloxy group (R-O/Ar-O).

Classified into Symmetric and Unsymmetric ethers.

Ester Formation

(CH₃CO)₂O + C₆H₅OH + NaOH → CH₃COONa + CH₃COOC₆H₅ + H₂O

[Phenyl Acetate]

C₆H₅COCl+C₆H₅OH+NaOH → C₆H₅COOC₆H₅+NaCl+H₂O

[Phenyl Benzoate]

Commonly used alcohols: Methanol, Ethanol, Isopropyl alcohol, Ethylene Glycol.

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Chapter Related Links
Physical and Chemical Properties of Alcohol	Kolbe’s Reaction	Etard Reaction
Benzyl Alcohol	Methyl Salicylate	Fehling’s Test
Tollen’s Test	Phenol Preparation	Cannizzaro Reaction

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CBSE CLASS XII Related Questions

1.
(i) A first order reaction is 20% complete in 10 minutes. Calculate the time taken when 80% of the reaction will be completed.
[Given : log 5 = 0.7, log 4 = 0.6]
(ii) For a chemical reaction \( \mathrm{R \rightarrow P} \), variation in \( \ln[\mathrm{R}] \) vs. time (t) graph is given below :
(I) Predict the order of the reaction.
(II) Write the slope of the curve.
View Solution
2.
Conductivity of \( 2.5 \times 10^{-4} \) M methanoic acid solution is \( 5.25 \times 10^{-5} \) S cm\(^{-1}\).
(a) Calculate its molar conductivity.
(b) Calculate its degree of dissociation.
[Given : \( \lambda^{\circ}_{(\mathrm{H^+})} = 349.5 \) S cm\(^2\) mol\(^{-1}\) and \( \lambda^{\circ}_{(\mathrm{HCOO^-})} = 50.5 \) S cm\(^2\) mol\(^{-1}\)]
View Solution
3.
(i) A first order reaction is 20% complete in 10 minutes. Calculate the time taken when 80% of the reaction will be completed.
[Given : \( \log 5 = 0.7 \), \( \log 4 = 0.6 \)]
(ii) For a chemical reaction \( \mathrm{R \rightarrow P} \), variation in \( \ln[\mathrm{R}] \) vs. time (t) graph is given below :
(I) Predict the order of the reaction.
(II) Write the slope of the curve.
View Solution
4.
(i) Give a chemical test to distinguish between Propanal and Propanone.
(ii) Which of the given acids is stronger and why ? \( \mathrm{F_3C{-}C_6H_4{-}COOH} \) or \( \mathrm{H_3C{-}C_6H_4{-}COOH} \)
(iii) Complete the given reaction sequence :
\[ \mathrm{CH_3CH_2CH_2COOC_2H_5} \xrightarrow{\mathrm{NaOH}} \mathrm{A + C_2H_5OH} \]
\[ \mathrm{A} \xrightarrow{\mathrm{H_3O^+}} \mathrm{B} \]
View Solution
5.
(a) Define 'Denatured Protein' with an example.
(b) What happens when glucose reacts with HCN ? Write the reaction involved.
(c) Name the disease caused by the deficiency of Vitamin C.
View Solution
6.
Explain the Finkelstein reaction.
View Solution