Class 12 Chemistry CBSE Aldehydes and Ketones Board Questions
Here we provide Class 12 chemistry important notes,board questions and predicted questions with Answers for chapter Aldehydes and Ketones. These important notes,board questions and predicted questions are based on CBSE board curriculum and correspond to the most recent Class 12 chemistry syllabus. By practising these Class 12 materials, students will be able to quickly review all of the ideas covered in the chapter and prepare for the Class 12 Board examinations as well as other entrance exams such as NEET and JEE.
2020
Q1
(a) An organic compound (A) having molecular formula C4H8O gives orange red
precipitate with 2, 4-DNP reagent. It does not reduce
Tollens’ reagent but gives yellow precipitate of iodoform on heating
with NaOH and I2. Compound (A) on reduction with NaBH4 gives
compound (B) which undergoes dehydration reaction on heating with
conc. H2SO4 to form compound (C). Compound (C) on Ozonolysis
gives two molecules of ethanal.
Identify (A), (B) and (C) and write their structures. Write the reactions of compound (A) with (i) NaOH/I2 and (i) NaBH4.
(b) Give reasons:
(i) Oxidation of propanal is easier than propanone.
(ii) α-hydrogen of aldehydes and ketones is acidic in nature.
solutions
Identify (A), (B) and (C) and write their structures. Write the reactions of compound (A) with (i) NaOH/I2 and (i) NaBH4.
(b) Give reasons:
(i) Oxidation of propanal is easier than propanone.
(ii) α-hydrogen of aldehydes and ketones is acidic in nature.
solutions
OR
Q1
(a) Draw structures of the following derivatives :
(i) Cyanohydrin of cyclobutanone
(ii) Hemiacetal of ethanal
(b) Write the major product(s) in the following :
(c) How can you distinguish between proponal and propanone
solutions
(i) Cyanohydrin of cyclobutanone
(ii) Hemiacetal of ethanal
(b) Write the major product(s) in the following :
(c) How can you distinguish between proponal and propanone
solutions
2019
Q1
Complete the following reactions :
solutions
solutions
OR
Q1
Write chemical equations for the following reactions :
(i) Propanone is treated with dilute Ba(OH)2
(ii) Acetophenone is treated with Zn(Hg)/Conc. HCl
(iii) Benzoyl chloride is hydrogenated in presence of Pd/BaSO4
solutions
(i) Propanone is treated with dilute Ba(OH)2
(ii) Acetophenone is treated with Zn(Hg)/Conc. HCl
(iii) Benzoyl chloride is hydrogenated in presence of Pd/BaSO4
solutions
2018
Q1
How do you convert the following
(a) Ethanol to Propanone
(b) Toluene to Benzoic acid
solutions
(a) Ethanol to Propanone
(b) Toluene to Benzoic acid
solutions
2017
Q1
(a) Write the product(s) in the following reactions :
(b) Give simple chemical tests to distinguish between the following pairs of compounds :
(i) Butanal and Butan-2-one
(ii) Benzoic acid and Phenol
solutions
(b) Give simple chemical tests to distinguish between the following pairs of compounds :
(i) Butanal and Butan-2-one
(ii) Benzoic acid and Phenol
solutions
2016
Q1
(a) Write the structures of A and B in the following reactions :
(b) Distinguish between:
(i) C6H5-COCH3 and C6H5-CHO
(ii) CH3COOH and HCOOH
(c) Arrange the following in the increasing order of their boiling points : CH3,CH3COOH,CH3CH2OH
solutions
(b) Distinguish between:
(i) C6H5-COCH3 and C6H5-CHO
(ii) CH3COOH and HCOOH
(c) Arrange the following in the increasing order of their boiling points : CH3,CH3COOH,CH3CH2OH
solutions
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