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प्रश्न
Write a reaction to distinguish acetaldehyde from acetone.
Write a chemical test to distinguish between the following pair of compounds:
Acetaldehyde and acetone
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उत्तर
1. Tollens’ reagent test: Acetaldehyde being an aldehyde reduces Tollens’ reagent to shining silver mirror, whereas propanone being acetone does not.
\[\ce{\underset{\text{Acetaldehyde}}{CH3CHO} + \underset{\text{Tollens’ reagent}}{2[Ag(NH3)2]+} + 3OH- -> \underset{\text{Acetate ion}}{CH3COO-} + \underset{\text{Silver metal}}{2Ag ↓} + 4NH3 + 2H2O}\]
\[\ce{\underset{\text{Acetone}}{CH3COCH3} ->[Tollens{'}reagent] No silver mirror}\]
2. Fehling’s solution test: Acetaldehyde reduces Fehling’s solution to red precipitate of Cu2O, whereas acetone does not react.
\[\ce{\underset{Acetaldehyde}{CH3CHO} + \underset{{From Fehling’s solution}}{2Cu^2+ + 5OH^-} → \underset{Acetate ion}{CH3COO^-} + \underset{Cuprous oxide (Red ppt{.})}{Cu2O↓} + 3H2O}\]
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संबंधित प्रश्न
Answer in brief.
Observe the following equation of reaction of Tollens' reagent with aldehyde. How do we know that a redox reaction has taken place? Explain.
\[\ce{R-CHO + 2Ag(NH_{3})^{+}_{2} + OH^{-}->[\triangle] R-CO{O}^{-} + 2Ag↓ + 4NH3 + 2H2O}\]
Benzaldehyde gives all tests positive EXCEPT ____________.
Ethyl methyl ketone can be reduced to n-butane by which of the following reactions?
Which of following is not a property of red phosphorus?
Which of the following compounds does NOT undergo aldol condensation?
\[\begin{array}{cc} \phantom{...}\ce{R}\phantom{.................}\ce{R}\phantom{..}\ce{H}\phantom{................}\\ \phantom{...}\backslash\phantom{..................}\backslash/\phantom{..........}\phantom{.......}\\ \ce{C = O ->[H2NNH2][KOH/glycol] C + N2 + H2O}\\ \phantom{}/\phantom{............}\phantom{.......}/\phantom{}\backslash\phantom{...............}\\ \phantom{}\ce{R}\phantom{..................}\ce{R}\phantom{..}\ce{H}\phantom{...............} \end{array}\]
Reaction is called ____________.
An aldehyde or ketone reacts with hydrogen cyanide to form corresponding cyanohydrin derivatives. This reaction is an example of ____________.
Which of the following represents the structure of isopropyl methyl ketone?
Fehling solution is ____________.
The first oxidation product of secondary alcohols is ____________.
‘B’ is:
In which case, chiral carbon is not generated by reaction with HCN.
In which of the following reactions new carbon-carbon bond is not formed?
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their ____________.
How will you convert benzaldehyde into the following compound?
Benzoic acid
How is the following conversion effected propanal into butanone?
How will you prepare acetic anhydride from acetic acid?
How acetone is converted into propane.
Which of the following compound will show a positive silver mirror test?
The reagent used in Wolf - Kishner reduction is ______.
Which one of the following reactions will not result in the formation of a carbon-carbon bond?
What is the number of different products formed when mixture of ethanal and propanal reacts with aq. NaOH after warming?
Which of the following compounds does not undergo a haloform reaction?
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.
Identify B in the following reaction:
\[\begin{array}{cc}
\ce{O}\phantom{........}\\
||\phantom{........}\\
\ce{\underset{(Acetone)}{CH3 - C - CH3}->[CrO3] B}
\end{array}\]
Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.
Which from following compounds does NOT undergo haloform reaction?
