CBSE Class 12 Chemistry Aldehydes Ketones And Carboxylic Acids

Scroll down for PDF

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

Please click the link below to download full pdf file for CBSE Class 12 Chemistry Aldehydes Ketones And Carboxylic Acids.

Tags: 


Click on the text For more study material for Chemistry please click here - Chemistry

Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

Registration of NEET 2020 starts

The NEET 2020 registration process would start on Monday, December 2nd, 2019. National Testing Agency, NTA would carry out the county’s undergraduate entrance exam for medical and dental admissions.  The examination is scheduled to take place in English, Hindi, and...

CBSE Circular Aryabhatta Ganit Challenge

For students with a keen interest in mathematics are now provided with a better opportunity to explore their knowledge. CBSE has announced to conduct an exam for the purpose of generating interest in maths among students. It is a trial to clarify the myth that...

Extension of dates by CBSE for Single Girl Child Merit (SGC) scholarship

CBSE has announced to extend dates for SGC scholarship. Previously the dates to submit the SGC scholarship form were 18 October 2019. Now dates have shifted. For online submission, the last date is 31st October. Whereas date for submission of hard copies of renewal...

CBSE Board Introduces Experiential Learning for Student

CBSE Academic Session 2019-20: Board Introduces Experiential Learning for Student: The education sector has grown for some new changes. As per the latest updates the Central Board of Secondary Education has been good in making all the possible efforts to improve...

CBSE to conduct a voluntary test for class 11th and 12th

Nowadays students have the liberty to choose the field they seem to fit in. A few years back the problem was parents who burdened children with their own choices. On the other side, now students along with their parent's support are free to choose their field. Not any...

×
Studies Today