Therefore, Benzaldehyde does NOT give Fehling’s test.
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प्रश्न
Benzaldehyde does NOT show positive test with ______.
पर्याय
Schiff reagent
Tollens' reagent
Sodium bisulphite solution
Fehling solution
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उत्तर
Benzaldehyde does NOT show positive test with Fehling solution.
Explanation:
Benzaldehyde is an aromatic aldehyde. Aromatic aldehydes do not reduce Fehling solution, so the test is negative. But they do give:
- Schiff test
- Tollens’ test
- Sodium bisulphite addition
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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.
\[\ce{R-CHO + 2Ag(NH_{3})^{+}_{2} + OH^{-}->[\triangle] R-CO{O}^{-} + 2Ag↓ + 4NH3 + 2H2O}\]
Write the name of the product when ketones react with 1,2-diol in presence of dry HCl.
Write another name of disproportionation reaction?
Write reactions for the action of the following reagents on p-chlorobenzaldehyde.
Tollen’s reagent
Ethyl methyl ketone can be reduced to n-butane by which of the following reactions?
Identify A in the following reaction.
\[\ce{A + CH3MgBr ->[Ether] complex ->[H3O+] (CH3)3C - OH}\]
Which of the following gives red precipitate with Fehling's solution?
An aldehyde or ketone reacts with hydrogen cyanide to form corresponding cyanohydrin derivatives. This reaction is an example of ____________.
Fehling solution is ____________.
Which of the following is Clemmensen reduction?
Which among the following compounds does NOT undergo aldol condensation?
Predict the product Z in the following series of reactions.
\[\ce{Ethanoic acid ->[PCl5] X ->[C6H6][Anhydrous AlCl3] Y ->[i) CH3MgBr][H3O^+] Z}\]
\[\ce{Ethanoic acid ->[P/Br2] 2-bromoethanoic acid}\]. This reaction is called ____________.
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their ____________.
What is the action of HCN on 2, 4-dichlorobenzaldehyde?
What is the action of HCN on ethanal?
Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.
How is the following conversion effected phenyl methanal into benzoin?
How will you prepare acetamide from methyl cyanide?
How will you prepare malachite green from benzaldehyde?
How will you prepare cinnamic acid from benzaldehyde?
Which one of the following substituents at para-position is most effective in stabilizing the phenoxide
ion?
Which of the following compound will give positive iodoform test?
Which of the following reaction does not involve either oxidation or reduction?
What is the number of different products formed when mixture of ethanal and propanal reacts with aq. NaOH after warming?
Identify the reaction in which carbonyl group of aldehydes and ketones is reduced to methylene group on treatment with zinc-amalgam and cone. HCI.
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?
Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.
What is the action of the following regent on propanal?
Sodium Bisulphite
Which from following tests confirms presence of aldehydic group in glucose?
