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Most important questions from Alcohol, Phenol and Ethers - XII CBSE

Important questions from Alcohol, Phenol and Ethers

1. Write the structure of the molecule of a compound whose IUPAC name is 1-phenylpropan-2-ol.

2. How would you convert ethanol to ethene?

3. Draw the structure of 2, 6-Dimethylphenol.

4. Draw the structural formula of 2-methylpropan- 2-ol molecule.

5. Draw the structure of hex-l-en-3-ol compound.

6. Ortho nitrophenol has lower boiling point than p-nitrophenol. Why?

7. Ortho-nitrophenol is more acidic than ortho-methoxyphenol. Why?

8. The C-O bond is much shorter in phenol than in ethanol. Give reason.

9. Of the two hydroxy organic compounds ROH and R’OH, the first one is basic and other is acidic in behaviour. How is R different from R’?

10. Give a chemical test to distinguish between 2-Pentanol and 3-Pentanol.

11. Write the chemical reaction to explain Kolbe’s reaction.

12. How would you obtain ethane-1, 2-diol from ethanol?

13. How would you obtain acetophenone from phenol?

14. How would you obtain phenol from benzene?

15. Which of the following isomers is more volatile : o-nitrophenol or p-nitrophenol?

16. Write equation of the nitration of anisole.

17. What happens when phenol is oxidized by Na2Cr2O7/H2SO4?

18. What happens when phenol is heated with zinc dust?

19. What happens when phenol is treated with bromine water?

20. What happens when phenol is treated with bromine in thr presence of CS2?

21. Give simple chemical tests to distinguish between the following pairs of compounds: Benzoic acid and Phenol (Ferric Chloride Test)

22. Williamsons synthesis of an ether

23. Explain the following reactions with an example for each :

(i) Reimer-Tiemann reaction

(ii) Friedel-Crafts reaction.

24. How are the following conversions carried out?

(i) Propene to propan-2-ol

(ii) Ethylmagnesium chloride to propan-1-ol.

25. How are the following conversions carried out?

(i) Benzyl chloride to benzyl alcohol,

(ii) Methyl magnesium bromide to 2-methylpropan-2-ol.

26. How would you obtain

(i) Picric acid (2, 4, 6-trinitrophenol) from phenol,

(ii) 2-Methylpropene from 2-methylpropanol?

27. Explain the following behaviours :

(i) Alcohols are more soluble in water than the hydrocarbons of comparable molecular masses.

(ii) Ortho-nitrophenol is more acidic than ortho-methoxyphenol.

28. Explain the mechanism of dehydration of ethanol to form alkene.

29. Explain the mechanism of dehydration of ethanol to form ether.

30. How will you convert:

(i) Propene to propan-2-ol?

(ii) Phenol to 2, 4, 6-trinitrophenol?

31. How will you convert the following?

(i) Propan-2-ol to propanone

(ii) Phenol to 2, 4, 6-tribromophenol

32. How will you convert:

(i) Propene to Propane-1-ol?

(ii) Ehtanal to Propan-2-ol

33. Arrange the following compounds in the increasing order of their acid strength: p-cresol, p-nitrophenol, phenol

34. Explain the mechanism of the following reactions :

(i) Addition of Grignard’s reagent to the carbonyl group of a compound forming an adduct followed by hydrolysis.

(ii) Acid catalysed dehydration of an alcohol forming an alkene.

35. Explain the following observations :

(i) The boiling point of ethanol is higher than that of methoxymethane.

(ii) Phenol is more acidic than ethanol.

(iii) o- and p-nitrophenols are more acidic than phenol.

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