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प्रश्न
Write a reaction to distinguish acetaldehyde from acetone
उत्तर १
Tollens’ reagent test: Acetaldehyde being an aldehyde reduces Tollens’ reagent to shining silver mirror, whereas propanone being acetone does not.
\[\ce{\underset{\text{Acetaldehyde}}{CH3CHO} + \underset{\text{Tollens’ reagent}}{2[Ag(NH3)2]+} + 3OH- -> \underset{\text{Acetate ion}}{CH3COO-} + \underset{\text{Silver metal}}{2Ag ↓} + 4NH3 + 2H2O}\]
\[\ce{\underset{\text{Acetone}}{CH3COCH3} ->[Tollens 'reagent] No silver mirror}\]
उत्तर २
Fehling’s solution test: Acetaldehyde reduces Fehling’s solution to red precipitate of Cu2O whereas acetone being a ketone does not.
\[\ce{\underset{\text{Acetaldehyde}}{CH3CHO} + \underset{\text{From Fehling’s solution}}{2Cu^2+ + 5OH-} ->\underset{\text{Acetate ion}}{CH3COO-} + \underset{\text{Cuprous oxide (Red ppt.)}}{Cu2O ↓} + 3H2O}\]
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संबंधित प्रश्न
The following compounds will give positive Fehling’s test.
Write another name of disproportionation reaction?
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\[\ce{Acetaldoxime ->[Na][alcohol] A ->[NaNO2][HCl] B + H2O + N2\uparrow}\]
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\[\ce{Benzaldehyde ->[Nitration] {m}-Nitrobenzaldehyde}\]
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Identify A, B and C.
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Write reactions when phenol reacts with Dilute HNO3
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Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.
