Aldehydes, Ketones and Carboxylic Acids — Important Questions
ICSE · Class 12 · Chemistry
103 important questions from Aldehydes, Ketones and Carboxylic Acids for ICSE Class 12 Chemistry, with answers. Written for the board exams 2027.
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Important Questions from Aldehydes, Ketones and Carboxylic Acids
What is the product of the reaction: Acetaldehyde + HCN →?
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CH3CH(OH)CN (lactonitrile)
HCN adds to acetaldehyde in nucleophilic addition to give CH3CH(OH)CN (lactonitrile or acetaldehyde cyanohydrin).
Aldehydes give a silver mirror with Tollens' reagent. This is because they are:
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Reducing agents
Aldehydes are oxidised to carboxylic acids by Tollens' reagent (ammoniacal AgNO3), reducing Ag+ to Ag (silver mirror). They act as reducing agents.
What is the product of aldol condensation of acetaldehyde (CH3CHO) with dilute NaOH?
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3-hydroxybutanal (aldol)
2 CH3CHO (dilute NaOH) → CH3CH(OH)CH2CHO (3-hydroxybutanal = aldol). This is the classic aldol condensation product.
Which of the following does NOT reduce Fehling's solution?
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Benzaldehyde (C6H5CHO)
Aromatic aldehydes (like benzaldehyde) do NOT reduce Fehling's or Benedict's solution. Only aliphatic aldehydes give red Cu2O precipitate.
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