CBSE Class 12 Chemistry Worksheet - Alcohols And Phenols. CBSE issues sample papers every year for students for class 12 board exams. Students should solve the CBSE issued sample papers to understand the pattern of the question paper which will come in class 12 board exams this year. The sample papers have been provided with marking scheme. It’s always recommended to practice as many CBSE sample papers as possible before the board examinations. Sample papers should be always practiced in examination condition at home or school and the student should show the answers to teachers for checking or compare with the answers provided. Students can download the sample papers in pdf format free and score better marks in examinations. Refer to other links too for latest sample papers.
Q1. Give IUPAC names and structures of:-
(a) Isobutyl alcohol (b) Sec – butyl alcohol
(c) tert-butyl alcohol (d) n-amyl alcohol
(e) o-cresol (f) Catechol
(g) glycerol (h) picric acid
(i) vinyl alcohol (j) benzyl ale
(k) Aspirin (l) cyclobexyl methanol
Q2. Give reasons for the following:-
(i) Commercially carboxylic acids are not reduced to alcohols directly instead alcohols are obtained by converting them to ester followed by their reduction.
(ii) Alcohols and phenols are Bronsted acids.
(iii) Alcohols are weaker acids than water.
(iv) In esterification reaction between carboxylic and alcohol, water is removed as soon as it’s formed.
(v) Esterification reaction between acid chloride and alcohol is carried out in presence of pyridine.
(vi) 3, 3-Dimethyl butan-2-ol on acid catalyzed dehydration yields an unexpected 2,3-dimethyl but 2-ene as major product.
(vii) n-hexanol is not soluble in water
(viii) Unlike most phenols, 2, 4-dinitrophenol & 2, 4, 6–trinitraphenol is soluble in aqueous sodium bicarbonate solution.
(ix) Phenol has a smaller dipole moment (1.54, 0) than methanol (1.71 D)
(x) For the prepn of alkyl halides from alcohols, through chloride is preferred over other reagents.
(xi) Phenols do not give protonation reactions easily.
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