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Aldehyde ketones and acids

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ORGANIC CHEMISTRY-I

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ALDEHYDE KETONES AND ACIDS (IMP QUESTIONS)

  1. Write the equations involved in the following reactions: a. Wolff-Kishner reduction b. Etard reaction c. Stephen reduction

  2. Write the reagents required in the following reactions: a. CH 2 = CH−CH 2 OH → CH 2 = CH–CHO b. CH 3 – COOH → CH 3 −CONH 2

  3. Arrange the following compounds in increasing order of their property as indicated: a. CH 3 COCH 3 , C 6 H 5 COCH 3 , CH 3 CHO (reactivity towards nucleophilic addition reaction) b. Cl−CH 2 −COOH, F −CH2−COOH, CH 3 −COOH (acidic character)

  4. Give simple chemical tests to distinguish between the following pairs of compounds: a. Ethanal and Propanol b. Benzoic acid and Phenol

  5. Write the equation involved in the acetylation of Salicylic acid.

  6. Give the structure of A, B and C in the following reactions:

  7. Predict the products of the following reactions:

  8. Write structures of compounds A, B and C in each of the following reactions:

  9. Do the following conversions in not more than two steps: a. Benzoic acid to benzaldehyde b. Ethyl benzene to Benzoic acid c. Propanone to Propene

  10. Predict the products of the following reactions:

  11. Although pentoxide ion has more number of resonating structures than Carboxylate ion, Carboxylic acid is a stronger acid than phenol. Give two reasons.

  12. How would you account for the following: a. Aldehydes are more reactive than ketones towards nucleophiles. b. The boiling points of aldehydes and ketones are lower than of the corresponding acids. c. The aldehydes and ketones undergo a number of addition reactions.

  13. Give chemical tests to distinguish between: a. Acetaldehyde and benzaldehyde b. Propanone and propanol

  14. Illustrate the following name reactions by giving example. a. Cannizzaro’s reaction b. Clemmensen reduction c. Hell-Volhard-Zelinsky reaction

  15. An organic compound A contains 69% carbon, 11% hydrogen and rest oxygen. The molecular mass of the compound is 86. It does not reduce Tollen’s reagent but forms and addition compound with sodium hydrogen sulphite and gives positive iodoform test. On vigorous oxidation it gives ethanoic and propanoic acid. Derive the possible structure of compound A.

  16. How are the following obtained? a. Benzoic acid form ethyl benzene. b. Benaldehyde from toluene.

  17. Complete each synthesis by giving the missing material, reagent or products:

  18. How are the following conversions carried out? a. Ethylcyanide to ethanoic acid. b. Butanol to Butanoic acid c. Benzoic acid to m-bromobenzoic acid

  19. Illustrate the following reactions suitable example for each. a. Cross aldol condensation b. Decarboxylation

  20. Give simple tests to distinguish between the following pairs of compounds a. Pentan-2-one and pentan-3-one b. Benaldehyde and acetophenone c. Phenol and benzoic acid

  21. How will you bring about the following conversions? a. Propanone to propane b. Benzoyl Chloride to benzaldehyde c. Ethanal to but-2-enal

  22. Write the products of the following reactions:

  23. Give simple chemical tests to distinguish between the following pairs of compounds: a. Benzaldehyde and benzoic acid, b. Propanal and propanone.

  24. Account for the following: a. CH 3 CHO is more chemical reactive than CH 3 COCH 3 towards reaction with HCN. b. Carboxylic acid is a stronger acid than phenol.

  25. How will you convert the following a. Propanone to Propan-2-ol b. Ethanal to 2-hydroxy propanoic acid c. Toluene to benzoic acid

  26. Give simple chemical test to distinguish between: a. Pentan-2-one and Pentan-3-one b. Ethanal and Propanal

  27. State chemical tests to distinguish between the following pairs of compounds: a. Propanal and Propanone b. Phenol and Benzoic acid

  28. How will you bring about the following conversions: a. Ethanol to3-hydroxybutanal b. Benzaldehyde to Benzophenone

  29. An organic compound a has the molecular formula C 8 H 16 O 2. It gets hydrolyzed with dilute sulphuric acid and gives a carboxylic acid B and an alcohol C. Oxidation of C with chromic acid also produced B. C on dehydration reaction gives but-1-ene. Write equations for the reactions involved.

  30. Describe how the following conversions can be brought about: a. Cyclohexene to cyclohexene 1-one b. Ethyl Benzene to benzoic acid c. Bombazine to benzoic acid.

  31. How are the following conversions carried out: a. Ethyl Cyanide to ethanoic acid b. Butan-1-o1 to butanoic acid c. Methylbenzene to benzoic acid

  32. Complete each synthesis by giving missing reagents or products in the following:

  33. Write a suitable chemical equation to complete each of the following transformations: a. Butan-1-o1 to butanoic acid b. 4-Methylacetophenone to benzene-1, 4-dicarboxylic acid

  34. An organic compound with molecular formula C 9 H 10 O forms 2,4-DNP derivative, reduces Tonen's reagent and undergoes Cannizzaro's reaction. On vigorous oxidation it gives 1,2-benzenedicarboxylic acid, Identify the compound.

  35. Give chemical tests to distinguish between a. Propanol and propanone b. Benzaldehyde and acetophenone

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Aldehyde ketones and acids

Course: ORGANIC CHEMISTRY-I

38 Documents
Students shared 38 documents in this course

University: Amity University

Was this document helpful?
Name : ÉÉÉÉÉÉÉÉÉÉÉÉ.
ALDEHYDE KETONES AND ACIDS (IMP QUESTIONS)
1. Write the equations involved in the following reactions:
a. Wolff-Kishner reduction
b. Etard reaction
c. Stephen reduction
2. Write the reagents required in the following reactions:
a. CH2 = CHCH2OH CH2 = CHÐCHO
b. CH3 Ð COOH CH3CONH2
3. Arrange the following compounds in increasing order of their property as indicated:
a. CH3COCH3, C6H5COCH3, CH3CHO (reactivity towards nucleophilic addition reaction)
b. ClCH2COOH, F CH2COOH, CH3COOH (acidic character)
4. Give simple chemical tests to distinguish between the following pairs of compounds:
a. Ethanal and Propanol
b. Benzoic acid and Phenol
5. Write the equation involved in the acetylation of Salicylic acid.
6. Give the structure of A, B and C in the following reactions:
7. Predict the products of the following reactions:
8. Write structures of compounds A, B and C in each of the following reactions:
9. Do the following conversions in not more than two steps:
a. Benzoic acid to benzaldehyde
b. Ethyl benzene to Benzoic acid
c. Propanone to Propene
10. Predict the products of the following reactions:
11. Although pentoxide ion has more number of resonating structures than Carboxylate ion, Carboxylic acid is a stronger acid than
phenol. Give two reasons.
12. How would you account for the following:
a. Aldehydes are more reactive than ketones towards nucleophiles.
b. The boiling points of aldehydes and ketones are lower than of the corresponding acids.
c. The aldehydes and ketones undergo a number of addition reactions.
13. Give chemical tests to distinguish between:
a. Acetaldehyde and benzaldehyde
b. Propanone and propanol
14. Illustrate the following name reactions by giving example.
a. CannizzaroÕs reaction
b. Clemmensen reduction
c. Hell-Volhard-Zelinsky reaction
15. An organic compound A contains 69.77% carbon, 11.63% hydrogen and rest oxygen. The molecular mass of the compound is 86.
It does not reduce TollenÕs reagent but forms and addition compound with sodium hydrogen sulphite and gives positive iodoform
test. On vigorous oxidation it gives ethanoic and propanoic acid. Derive the possible structure of compound A.
16. How are the following obtained?
a. Benzoic acid form ethyl benzene.
b. Benaldehyde from toluene.