Advertisements
Advertisements
Questions
Write a reaction to distinguish acetaldehyde from acetone.
Write a chemical test to distinguish between the following pair of compounds:
Acetaldehyde and acetone
Advertisements
Solution
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.
\[\ce{\underset{Acetaldehyde}{CH3CHO} + \underset{{From Fehling’s solution}}{2Cu^2+ + 5OH^-} → \underset{Acetate ion}{CH3COO^-} + \underset{Cuprous oxide (Red ppt{.})}{Cu2O↓} + 3H2O}\]
APPEARS IN
RELATED QUESTIONS
Benzaldehyde does NOT show positive test with ______.
_____________ reaction is used to synthesize straight alkyl substituted benzenes.
Write the name of the product when ketones react with 1,2-diol in presence of dry HCl.
Write another name of disproportionation reaction?
Identify B in the following reaction,
\[\ce{Acetaldoxime ->[Na][alcohol] A ->[NaNO2][HCl] B + H2O + N2\uparrow}\]
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 is Clemmensen reduction?
Which among the following compounds does NOT undergo aldol condensation?
\[\ce{CH2 = CH2 ->[i) O3][ii) Zn/H2O] X ->[NH3] Y}\] ‘Y’ is:
In which case, chiral carbon is not generated by reaction with HCN.
Identify A, B and C.
How will you convert benzaldehyde into the following compound?
Benzophenone
How will you convert benzaldehyde into the following compound?
Benzoic acid
How will you convert benzaldehyde into the following compound?
α-hydroxy phenyl acetic acid
Identify A, B and C.
How will you prepare lactic acid from ethanol?
How propanal is converted into propane.
Which of the following compound will give positive iodoform test?
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.
How are the following compound obtained from alkyne?
Acetaldehyde
What is the action of hydrogen cyanide on the following?
Acetone
Write a note on Clemmensen reduction.
Write the structure of the products obtained from the following ketones by action of hydrazine in presence of a slightly acidic medium.
Identify B in the following reaction:
\[\begin{array}{cc}
\ce{O}\phantom{........}\\
||\phantom{........}\\
\ce{\underset{(Acetone)}{CH3 - C - CH3}->[CrO3] B}
\end{array}\]
How will you prepare acetic anhydride from acetic acid?
Which from following tests confirms presence of aldehydic group in glucose?
The products formed in the following reaction, A and B are:
