A – CH3COCl
Acetic acid reacts with phosphorous pentachloride to give Acetyl chloride.
B – CH3CHO
Acetyl chloride undergoes Rosenmund reduction with Pd in the presence of BaSO4 to give Acetaldehyde.
C – CH3CH(OH)CH3
Acetaldehyde reacts with Grignard reagent to give 2-Propanol.
D – CH3CH2OH
Acetaldehyde gets reduced in the presence of Lithium aluminium hydride to give Ethanol.
• Butanal is an aldehyde and answers Tollens’ reagent but Ethyl methyl ketone does not answer.
• Upon reaction with Tollens reagent, Butanal gives silver mirror.
• Ethanoic acids answers the litmus test by changing red litmus blue whereas Ethanal does not answer this test as it is neutral in nature.
• This test is used for distinguishing Ethanal from Ethanoic acid.
(i) Propanal reacts with Zinc amalgam in the presence of conc. HCl to under goClemmenson Reduction and give the corresponding hydrocarbon, in this case propane.
(ii) Propanal reacts with Hydroxylamine to give the oxime of propane.
(iii) Propanal reacts with HCN to undergo a nucleophilic reaction giving a cyanohydrin.
• Aldehydes undergo nucleophilic addition reactions more easily than ketones.
• Formaldehyde undergoes nucleophilic addition easily than acetaldehyde.
• Thus, the decreasing order of reactivity is
• Acetophenone reacts with Iodoform test to prove the presence of CH3C=O group.
• This answers by giving a yellow precipitate.
• Benzaldehyde does not answer Iodoform test.
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