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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
Answer in brief.
Write reaction showing conversion of Acetaldehyde into acetaldehyde dimethyl acetal.
Addition of sodium bisulphite to ethanol is ____________ type of reaction.
The following compounds will give positive Fehling’s test.
Explain haloform reaction with suitable example.
Benzaldehyde gives all tests positive EXCEPT ____________.
Which of the following gives red precipitate with Fehling's solution?
ln which of the following reactions, both oxidised and reduced forms of the same compound are obtained?
If acetaldehyde is treated with Fehling's solution, the change that occurs in the system is ____________.
Which of following is not a property of red phosphorus?
Which of the following is Clemmensen reduction?
Which of the following is a Wolf - Kishner reduction?
Identify the product Y in the following series of reactions.
\[\ce{4-Nitrotoluene ->[(CH3CO)2O/CrO3][273 - 278 K] X ->[H3O^+][\Delta] Y}\]
\[\ce{CH2 = CH2 ->[i) O3][ii) Zn/H2O] X ->[NH3] Y}\] ‘Y’ is:
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their ____________.
Identify A, B, C and D.
\[\ce{ethanoic acid ->[SOCl2] A ->[Pd/BaSO4] B ->[NaOH] C ->[][\Delta] D}\]
What is the action of HCN on 2, 4-dichlorobenzaldehyde?
How will you prepare ethyl acetate from methyl acetate?
How will you prepare acetamide from methyl cyanide?
How will you prepare acetaldehyde from ethyne?
Aldehydes are readily oxidised to yield carboxylic acids but ketones are inert to oxidation. Which is the most likely explanation regarding this difference in reactivity?
A carbonyl compound A having molecular formula C5H10O forms crystalline precipitate with sodium bisulphate and gives positive iodoform test. A does not reduce Fehling solution. Identify A.
Write a note on Clemmensen reduction.
Write reactions when phenol reacts with Dilute HNO3
Write reactions when phenol reacts with Concentrated HNO3
Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.
How will you prepare acetic anhydride from acetic acid.
Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.
Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.
