Class 12 Chemistry Case Study Question Chapter 12 Aldehydes Ketones and Carboxylic Acids

In Class 12 Boards there will be Case studies and Passage Based Questions will be asked, So practice these types of questions. Study Rate is always there to help you. Free PDF Download of CBSE Class 12 Chemistry Chapter 12 Aldehydes Ketones and Carboxylic Acids Case Study and Passage Based Questions with Answers were Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Chemistry Case Study Question Aldehydes Ketones and Carboxylic Acids to know their preparation level.

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Aldehydes Ketones and Carboxylic Acids Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 12 Chemistry Chapter 12 Aldehydes Ketones and Carboxylic Acids

Case Study/Passage-Based Questions

Case Study 1: The addition reaction of enol or enolate to the carbonyl functional group of aldehyde or ketone is known as aldol addition. The β-hydroxy aldehyde or β-hydroxy ketone so obtained undergo dehydration in the second step to produce a conjugated enone. The first part of the reaction is an addition reaction and the second part is an elimination reaction. The Carbonyl compound having α-hydrogen undergoes an aldol condensation reaction.

The condensation reaction is the reverse of which of the following reaction?
(a) Lock and key hypothesis
(b) Oxidation
(c) Hydrolysis
(d) Glycogen formation

Answer:(c) Hydrolysis


Which of the following compounds would be the main product of an aldol condensation of acetaldehyde and acetone?

Answer:(b) ​


Which combination of carbonyl compounds gives phenyl vinyl ketone by an aldol condensation?

(a) Acetophenone and Formaldehyde
(b) Acetophenone and acetaldehyde
(c) Benzaldehyde and acetaldehyde
(d) Benzaldehyde and acetone

Answer:(a) Acetophenone and Formaldehyde ​


Which of the following will undergo aldol condensation?
(a) HCHO (b) CH3CH2OH
(c) C6H5CHO (d) CH3CH2CHO

Answer:(d) CH3CH2CHO ​​


Which of the following does not undergo aldol condensation?
(a) CH3CHO (b) CH3CH2CHO
(c) CH3COCH3 (d) C6H5CHO

Answer:(d) C6H5CHO ​​


Case Study/Passage-Based Questions

Case Study 2: When an aldehyde with no a-hydrogen reacts with concentrated aqueous NaOH, half the aldehyde is converted to carboxylic acid salt, and the other half is converted to alcohol. In other words, half of the reactant is oxidized and the other half is reduced. This reaction is known as the Cannizzaro reaction.

A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution gives
(a) benzyl alcohol and sodium formate
(b) sodium benzoate and methyl alcohol
(c) sodium benzoate and sodium formate
(d) benzyl alcohol and methyl alcohol.

Answer:(a) benzyl alcohol and sodium formate ​​


Which of the following compounds will undergo a Cannizzaro reaction?
(a) CH3CHO (b) CH3COCH3
(c) C6H5CHO (d) C6H5CH2CHO

Answer:(c) C6H5CHO ​​


Trichloroacetaldehyde is subjected to Cannizzaro’s reaction by using NaOH. The mixture of the products contains sodium trichloroacetate ions and another compound. The other compounds are
(a) 2, 2, 2-trichloroethanol
(b) trichloromethanol
(c) 2, 2, 2-trichloropropanol
(d) chloroform

Answer:(a) 2, 2, 2-trichloroethanol ​​


In Cannizzaro reaction given below :

(a) the attack OH– at the carboxyl group
(b) the transfer of hydride to the carbonyl group
(c) the abstraction of proton from the carboxylic group
(d) the deprotonation of PhCH2OH.

Answer:(b) the transfer of hydride to the carbonyl group ​​​


Which of the following reaction will not result in the formation of carbon-carbon bonds?
(a) Cannizzaro reaction
(b) Wurtz reaction
(c) Reimer-Tiemann reaction
(d) Friedel-Crafts’ acylation

Answer:(a) Cannizzaro reaction ​​​​


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