CBSE Class 12 Chemistry Aldehydes Ketones And Carboxylic Acids

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CBSE Class 12 Chemistry Aldehydes Ketones And Carboxylic Acids. 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.

ONE MARK QUESTIONS

1. Write short notes on the following: 

a. Clemmensen reduction

b. Aldol Condensation(2008)

c. Rosenmund reduction (2011)

d. Hell-Volhard-Zelinsky

e. Cannizzaro reaction

f. Cross Aldol Condensation reaction(2014)

2.Give the structure of the following: 

a. Hex-2-en-4-ynoic acid

b. 3-hydroxy butanal

c. p-Nitropropiophenone

d. 3-Bromo-4-phenylpentanoic acid

e. 3-Methylcyclohexane carbaldehyde

TWO MARK QUESTIONS

1.Explain the following mechanisms:

a) Nucleophilic attack on a carbonyl group of an aldehyde or a ketone.

b) Nucleophilic addition of Grignard reagent on a carbonyl group of an aldehyde or a ketone.

THREE MARK QUESTIONS

1.Distinguish the following:

a) Formic acid and Acetic acid

b) Phenol and benzoic acid(2014)

c) Benzaldehyde and ethanal

d) Benzaldehyde and acetophenone(2010)

2.Give the structure of the following:

a) Hex-2-en-4-ynoic acid

b) 2,3- dimethylcyclopentane carbaldehyde

c) p-Nitropropiophenone

FIVE MARK QUESTIONS

1.Arrange the following in the increasing order of the property given as indicated:

a) Acetaldehyde, acetone, Di-ter-butylketone, methyl-ter-butylketone (Reactivity towards HCl)

b) 2-Bromobutanoic acid, 3-bromobutanoic acid, 2-methypropanoic acid, butanoic acid (Acid strength)

c) CH3CHO, CH3CH2OH, CH3OCH3, CH3CH2CH3 (Boiling point)

d) Ethanal, Propanal, Propanone, Butanone (Nucleophilic addition)

e) Benzoic acid , 4- nitrobenzoic acid , 3,4- dinitrobenzoic acid , 4- methoxybenzoic acid (acid strength)

2.Effect the following conversions:

a. Propanone to propene

b. Propanal to 2-butanone

c. Ethanol to 3-hydroxy butanal

d. Benzaldehyde to 2-hydroxyphenyl aceticacid.

e. Acetaldehyde to isopropyl alcohol

3.Account for the following:

a) Carboxylic acids do not give reactions of carbonyl group .(2014)

b) Aldehydes are more reactive to nucleophilic addition than ketones.(2008)

c) Carboxylic acids have higher boiling points than aldehyde, ketones and even alcohols of comparable molecular mass.(2008)

d) Chloroacetic acid is stronger than acetic acid.(2014)

e) There is two –NH2 groups in semicarbazide , however only one is involved in the formation of semicarbazone.

4.a) 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 Tollens’ reagent but forms an addition compound with sodium hydrogen sulphite and give positiveiodoform test. On vigorous oxidation it gives ethanoic and propanoic acid. Write the possible structure of the compound A.

b) Write the chemical tests to distinguish between the following pairs of compounds:

i. Acetophenone and Benzophenone

ii. Ethanol and Propanal

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