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प्रश्न
Write a reaction to distinguish acetaldehyde from acetone
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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.
Write reactions for the action of the following reagents on p-chlorobenzaldehyde.
Tollen’s reagent
Benzaldehyde gives all tests positive EXCEPT ____________.
The product formed after reaction between benzaldehyde and methyl magnesium iodide followed by acid hydrolysis is ____________.
Identify the INCORRECT reaction.
Identify A in the following reaction.
\[\ce{A + CH3MgBr ->[Ether] complex ->[H3O+] (CH3)3C - OH}\]
If acetaldehyde is treated with Fehling's solution, the change that occurs in the system is ____________.
Compounds of general formula, are called ____________.
\[\begin{array}{cc} \phantom{...}\ce{R}\phantom{....}\ce{OR''}\phantom{}\\ \phantom{}\backslash\phantom{..}/\\ \ce{C}\\ \phantom{}/\phantom{..}\backslash\\ \phantom{...}\ce{R'}\phantom{...}\ce{OR''}\phantom{} \end{array}\]
Which of the following does not give yellow solid on treatment with sodium hypoiodlte?
Which of the following is a Wolf - Kishner reduction?
The formation of cyanohydrin from acetone is an example of ____________.
\[\ce{CH2 = CH2 ->[i) O3][ii) Zn/H2O] X ->[NH3] Y}\] ‘Y’ is:
Assertion: 2, 2-dimethyl propanoic acid does not give HVZ reaction.
Reason: 2-2, dimethyl propanoic acid does not have α-hydrogen atom.
\[\ce{Benzoic acid ->[i) NH3][ii) \Delta] A ->[NaOBr] B ->[NaNO2/HCl] C}\] ‘C’ is:
Assertion: p-N, N-dimethyl amino benzaldehyde undergoes benzoin condensation
Reason: The aldehydic (−CHO) group is meta directing.
Which one of the following undergoes reaction with 50% sodium hydroxide solution to give the corresponding alcohol and acid.
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 ____________.
In which of the following reactions new carbon-carbon bond is not formed?
How is the following conversion effected Hex-3-yne into hexan-3-one?
How will you prepare ethane from sodium acetate?
In the above reaction, product (B) is:
Which of the following is not correctly matched?
Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.
Give two examples which undergo Wolf-Kishner reduction.
Write the structure of the products obtained from the following ketones by action of hydrazine in presence of a slightly acidic medium.
What is the action of the following regent on propanal?
Sodium Bisulphite
How will you prepare Acetic anhydride from acetic acid ?
