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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.
Write reaction showing conversion of Acetaldehyde into acetaldehyde dimethyl acetal.
_____________ reaction is used to synthesize straight alkyl substituted benzenes.
Addition of sodium bisulphite to ethanol is ____________ type of reaction.
Ethyl methyl ketone can be reduced to n-butane by which of the following reactions?
Which of the following gives red precipitate with Fehling's solution?
If acetaldehyde is treated with Fehling's solution, the change that occurs in the system is ____________.
An aldehyde or ketone reacts with hydrogen cyanide to form corresponding cyanohydrin derivatives. This reaction is an example of ____________.
Compounds of general formula, are called ____________.
\[\begin{array}{cc} \phantom{...}\ce{R}\phantom{....}\ce{OR'}\phantom{}\\ \phantom{}\backslash\phantom{..}/\\ \ce{C}\\ \phantom{}/\phantom{..}\backslash\\ \phantom{...}\ce{H}\phantom{....}\ce{OR'}\phantom{} \end{array}\]
Which of the following will give positive iodoform test?
Which of the following is a Wolf - Kishner reduction?
Which of the following does NOT give yellow precipitate when reacted with (NaOH + I2) mixture?
The formation of cyanohydrin from acetone is an example of ____________.
\[\ce{Benzoic acid ->[i) NH3][ii) \Delta] A ->[NaOBr] B ->[NaNO2/HCl] C}\] ‘C’ is:
‘B’ is:
Assertion: p-N, N-dimethyl amino benzaldehyde undergoes benzoin condensation
Reason: The aldehydic (−CHO) group is meta directing.
Phenyl methanal is reacted with concentrated NaOH to give two products X and Y. X reacts with metallic sodium to liberate hydrogen X and Y are ____________.
Identify A, B and C.
What is the action of HCN on ethanal?
How is the following conversion effected Hex-3-yne into hexan-3-one?
Complete the following reaction.
\[\begin{array}{cc}
\ce{CH3 - CH2 - CH2 - C - CH3 ->[HO - CH2 - CH2 - CH2 - OH][dry HCl] ?}\\
||\phantom{.........}\\
\ce{O}\phantom{.........}
\end{array}\]
How will you prepare ethane from sodium acetate?
How propanal is converted into propane.
Which of the following reaction does not involve either oxidation or reduction?
Which of the following is most reactive towards the addition reaction of hydrogen cyanide to form the corresponding cyanohydrin?
Identify the reaction in which carbonyl group of aldehydes and ketones is reduced to methylene group on treatment with zinc-amalgam and cone. HCI.
Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.
What is the action of hydrogen cyanide on the following?
Acetone
Write a note on Clemmensen reduction.
How will you prepare acetic anhydride from acetic acid?
