Aldehydes, Ketones and Carboxylic Acids — Important Questions
Maharashtra Board · Class 12 · Chemistry
45 important questions from Aldehydes, Ketones and Carboxylic Acids for Maharashtra Board Class 12 Chemistry, with answers.
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Important Questions from Aldehydes, Ketones and Carboxylic Acids
Which of the following are characteristics of carboxylic acids?
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They have higher boiling points than aldehydes and ketones, They form dimers through hydrogen bonding, They turn blue litmus red, Lower members are soluble in water
Carboxylic acids are acidic (not basic), have high boiling points due to dimer formation through hydrogen bonding, turn blue litmus red, and lower members are water-soluble due to hydrogen bonding with water.
Which reaction is used to prepare aldehydes from acyl chlorides?
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Rosenmund reduction
Rosenmund reduction involves the reduction of acyl chlorides to aldehydes using hydrogen gas and palladium catalyst poisoned with barium sulfate.
True or False: Ketones give positive Tollens' test.
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False
Ketones do not give positive Tollens' test because they lack the -CHO group. Only aldehydes (except aromatic aldehydes like benzaldehyde with Fehling's solution) give positive Tollens' test.
What is the product when acetone reacts with HCN?
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Acetone cyanohydrin
Acetone (CH₃-CO-CH₃) reacts with HCN to form acetone cyanohydrin (CH₃-C(OH)(CN)-CH₃). This is a nucleophilic addition reaction.
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