CBSE Class 12 Chemistry Aldehydes Ketones And Carboxylic Acids Question Bank Set 05

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QUESTION BANK
Aldehydes, Ketones and carboxylic acids
 
1. Draw the structure of the following :
 
i) 4- Methoxybenzaldehyde
 
ii) 5- Bromo -3- Chloro -2- iodobenzoic acid
 
iii) 3,3 – Dimethyl -1- Chlorobutane
 
iv) 2,3- Dihydroxy -4-methylpentanal
 
v) 3- Hydroxy-2-methyl –propanal
 
vi) 2,4 –Dimethyl -3- pentanone
 
vii) 1,2 –Ethaneodioc acid
 
viii) 3- Pentene -2-one
 
ix) 1,3 – Propane –dioic acid
 
2. Give IUPAC names of following:
 
i) CH3CH(CH3)CH2CH2CHO                        ii) CH3CH2COCH(C2H5)CH2CH2Cl
 
iii) OHCC6H4CHO-p                                  iv) (CH3)3CCH2COOH
 
v) CH3CH=CHCHO                                   vi) CH3COCH2COCH3
 
vii) CH3CH(CH3)CH2C(CH3)2COCH3          viii) CH3CO(CH2)4CH3
 
ix) CH3CH2CHBrCH2CH(CH3)CHO             x) CH3(CH2)5CHO
 
xi) Ph-CH=CH-CHO                                 xii) PhCOPh
 
3. Draw structures of the following derivatives.
 
i) The 2,4-dinitrophenylhydrazone of Benzaldehyde
 
ii) Cyclopropanoneoxime
 
iii) Acetaldehydedimethylacetal
 
iv) The semicarbazone of cyclobutanone
 
v) The ethylene ketal of hexan-3-one
 
vi) The methyl hemiacetal of formaldehyde
 
4. Give Reasons :-
 
i) Carboxylic acid is stronger acid than phenol.
 
ii) Ethanol is more soluble in water than ethyl chloride.
 
iii) Aldehydes are more reactive than Ketones towards nucleophilic additions.
 
iv) Carboxylic acids has higher boiling points than alcohols of same no. of carbonatoms.
 
v) Ethanoic acid has molar mass of 120 in vapour state.
 
vi) Carboxylic acids do not give characteristic reactions of carbonyl group.
 
vii) Formal dehyde does not undergo aldol condensation.
 
viii)Fluoro acetic acid is a stronger acid than acetic acid.
 
5. Convert the following:
 
i) Toluene to Benzaldehyde
 
ii) Acetaldehyde to Acetamide
 
iii) Methanol to acetic acid
 
iv) Methanol to Ethanol
 
v) Acetic acid to Propionic acid
 
vi) Ethyl alcohol to acetone
 
vii) Acetone to tert- butyl alcohol
 
viii)Toluene to m- nitrobenzoic acid
 
ix) Phenol to acetophenone
 
x) Acetaldehyde to Acetone
 
6. Give simple chemical tests to distinguish between the following pairs of compounds.
 
i) Propanal and Propanone
 
ii) Acetophenone and Benzophenone
 
iii) Phenol and Benzoic acid
 
iv) Benzoic acid and Ethyl benzoate
 
v) Pentan-2-one and Pentan-3-one
 
vi) Benzaldehyde and Acetophenone
 
vii) Ethanal and Propanal
 
7. Describe the following:
 
i) Acetylation
 
ii) Cannizzaro reaction
 
iii) Cross aldol condensation
 
iv) Decarboxylation
 
8. Write chemical reactions to affect the following transformations:
 
i) Butan-1-ol to butanoic acid
 
ii) Benzyl alcohol to phenylethanoic acid
 
iii) 3-Nitrobromobenzene to 3-nitrobenzoic acid
 
iv) 4-Methylacetophenone to benzene-1,4-dicarboxylic acid
 
v) Cyclohexene to hexane-1,6-dioic acid
 
vi) Butanal to butanoic acid.
 
9. Which acid of each pair shown here would you expect to be stronger?
 
i) CH3CO2H or CH2FCO2H
 
ii) CH2FCO2H or CH2ClCO2H
 
iii) CH2FCH2CH2CO2H or CH3CHFCH2CO2H
 
10. Write the structure of alkenes that on ozonolysis will give ketone only.
 
11. What is the function of BaSO4 in rosenmund reaction?
 
12. Name the isomers with molecular formula C3H6O. Which one will have high boiling point?
 
13. What happens when acetaldehyde is kept with a trace of sulphuric acid? Write the structure of product.
 
14. What is the chemical name of Tollen’s reagent and Fehling’s solution
 
15. An organic compound with the molecular formula C9H10O forms 2,4-DNP derivative, reduces Tollens’ reagent and undergoes Cannizzaro reaction. On vigorous oxidation, it gives 1,2-benzenedicarboxylic acid. Identify the compound.
 
16. A compound ‘A’ with formula C5H10O gives a positive 2, 4 –DNP test but a negative Tollen’s test It can be oxidizing to carboxylic acid ‘B’ of molecular formula C3H6O2, when treated with alk. KMnO4 under vigorous conditions. The salt of ‘B’ gives a hydrocarbon ‘C’ on Kolbes’ electrolytic decarboxylation. Identify A,B,C & write chemical equations.
 
17. A compound A with molecular formula C5H12O on oxidation forms compound B with molecular formula C5H10O. The compound B gives iodoform test but does not reduce ammoniacal silver nitrate. The compound B on reduction with Zn – Hg/ HCl gives compound C with molecular formula C5H12. Identify A,B,C& give the chemical reactions involved.
 
18. Arrange the following compounds in increasing order of their property as indicated:
 
i) Acetaldehyde, Acetone, Di-tert-butyl ketone, Methyl tert-butyl ketone (reactivity towards HCN)
 
ii) CH3CH2CH(Br)COOH, CH3CH(Br)CH2COOH, (CH3)2CHCOOH,CH3CH2CH2COOH (acid strength)
 
iii) Benzoic acid, 4-Nitrobenzoic acid, 3,4-Dinitrobenzoic acid, 4-Methoxybenzoic acid (acid strength)
 
19. An organic compound A, which has a characteristic odour, on treatment with NaOH forms two compound B and C. Compound B has molecular formula C7H8O which on oxidation gives back A. Compound C is the sodium salt of an acid. C, when heated with soda lime yields an aromatic hydrocarbon D. deduce the structures of A to D.
 
20. Two moles of compound (A) on treatment with a strong base gives two compounds (B) and (C). The compound (B) on dehydrogenation with Cu gives (A) while acidification of (C) gives carboxylic acid (D) having molecular formula CH2O2. Identify (A) to (D).

 

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