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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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