CBSE Class 12 Chemistry Worksheet - Revision (4). 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. Use a Grignard’s reagent to prepare the following alcohols from butan-2-one;
a) 3-Methyl pentan-3-ol
b) 2-Phenyl pentan- 2-ol
Q2. Give the following reactions;
a) Kolbe’s reaction
b) Friedal Craft acylation
c) Fries rearrangement
d) Reimer Tiemann reaction
Q3. Give reasons for the following;
a) Why ethers are relatively inert compounds.
b) Ortho and para nitrophenols are more acidic than Phenols.
c) Why is the b.p. of glycol high.
Q4. Give a chemical test to distinguish between;
a) propan-2-ol and benzyl alcohol
b) Butan-1-ol and butan-2-ol
Q5. Write reaction for the preparation of phenol from cumene.
Q6. Describe the mechanism of the formation of diethyl ether from ethanol in the prescence of conc. H2SO4.
Q7. Out of o-Nitrophenol and p-Nitrophenol which steam volatile and why?
Q8. How will you convert;
a) Benzene to Phenol
b) Phenol to Benzoic acid
c) Aniline to Iodobenzene
Q9. How are ethers prepared by Williamson’s synthesis? What are limitations for preparing unsymmetrical ethers in this method?
Q10.What happens when;
a) Butanol is heated with SOCl2.
b) Methoxy propane is treated with HBr.
c) Anisole is reacted with HI at 373K.
Q11. Explain Hydroboration oxidation of alkene
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