Q13Written answer
Which of the following compounds do not undergo aldol condensation?
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Worked solution
Option (ii) and (iv) are the answers.
NCERT Exemplar · Class 12 · Chemistry
Chapter 12: Aldehydes, Ketones and Carboxylic Acids
Practice each question, then open the answer or worked solution.
II. Multiple Choice Questions (Type-II)
33 questionsQ14Written answer
Treatment of compound with NaOH solution yields
(i) Phenol
(ii) Sodium phenoxide
(iii) Sodium benzoate
(iv) Benzophenone
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Worked solution
Option (ii) and (iii) are the answers.
Q15Written answer
Which of the following conversions can be carried out by Clemmensen
Reduction?
(i) Benzaldehyde into benzyl alcohol
(ii) Cyclohexanone into cyclohexane
(iii) Benzoyl chloride into benzaldehyde
(iv) Benzophenone into diphenylmethane
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Worked solution
Option (ii) and (iv) are the answers.
Q16Written answer
Through which of the number of the following reactions of carbon atoms can be
increased in the chain?
(i) Grignard reaction
(ii) Cannizaro’s reaction
(iii) Aldol condensation
(iv) HVZ reaction
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Worked solution
Option (i) and (iii) are the answers.
Q17Written answer
Benzophenone can be obtained by ____________.
(i) Benzoyl chloride + Benzene + AlCl3
(ii) Benzoyl chloride + Diphenyl cadmium
(iii) Benzoyl chloride + Phenyl magnesium chloride
(iv) Benzene + Carbon monoxide + ZnCl2
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Worked solution
Option (i) and (ii) are the answers
Q18Written answer
Which of the following is the correct representation for intermediate of nucleophilic addition reaction to the given carbonyl compound (A) :
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Worked solution
Option (A) and (B) are the answers.
III. Short Answer Type
Q19Written answer
Why is there a large difference in the boiling points of butanal and butane-1-ol?
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Worked solution
Butanal has no intermolecular hydrogen bonding but butan-1-ol has intermolecular hydrogen bonding. This bonding in butan-1-ol makes it more stable at a higher temperature than butanal.
Q20Written answer
Write a test to differentiate between pentan-2-one and pentan-3-one.
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Worked solution
One can differentiate between pentan-2-one and pentan-3-one by iodoform test. Pentan-2-one have a –CO-CH3 group and therefore forms a yellow precipitate of Iodoform. Pentan-2-one gives a positive iodoform test, whereas, and pentan-3-one does not give a positive iodoform test because they don’t have a –CO-CH3 group.
Q21Written answer
Give the IUPAC names of the following compounds
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Worked solution
(i) 3-Phenylprop-2-ene-1-al.
(ii) Cyclohexanecarbaldehyde
(iii) 3-Oxopentan-1-al
(iv) IUPAC name: But-2-enal
Q22Written answer
Give the structure of the following compounds.
(i) 4-Nitropropiophenone
(ii) 2-Hydroxycyclopentanecarbaldehyde
(iii) Phenyl acetaldehyde
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Worked solution
(i)
(ii)
