Give simple chemical tests to distinguish between the following pairs of compounds.
(i) Propanal and Propanone
(ii) Acetophenone and Benzophenone
(iii) Phenol and Benzoic acid
(iv) Benzoic acid and Ethyl benzoate
(v) Pentan-2-one and Pentan-3-one
(vi) Benzaldehyde and Acetophenone
(vii) Ethanal and Propanal
Give simple chemical tests to distinguish between the following pairs of compounds.
(i) Propanal and Propanone
(ii) Acetophenone and Benzophenone
(iii) Phenol and Benzoic acid
(iv) Benzoic acid and Ethyl benzoate
(v) Pentan-2-one and Pentan-3-one
(vi) Benzaldehyde and Acetophenone
(vii) Ethanal and Propanal
a )Tollen's test –Due to oxidizing nature of aldehydes they get easily oxidized, wheareas in case of ketones they are not readily
oxidizable. And tollens test exploits this fact, [Ag (NH3)2]+ is used as reagent Ag mirror is formed during this reaction
b) fehling test- aldehyde reduces the fehling solu
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CH3—CH2—CHO does not undergo Cannizzaro reaction because it has α-hydrogen.
Acetaldehyde (CH3CHO) gives positive lodoform test and positive Fehling's solution test
CH3—CH2—CHO does not undergo Cannizzaro reaction because it has α-hydrogen.
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Chemistry Aldehydes, Ketones and Carboxylic Acids 2021
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