Therefore, Benzaldehyde does NOT give Fehling’s test.
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प्रश्न
Benzaldehyde does NOT show positive test with ______.
विकल्प
Schiff reagent
Tollens' reagent
Sodium bisulphite solution
Fehling solution
MCQ
रिक्त स्थान भरें
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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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Chemical Properties of Aldehydes and Ketones
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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.
\[\ce{R-CHO + 2Ag(NH_{3})^{+}_{2} + OH^{-}->[\triangle] R-CO{O}^{-} + 2Ag↓ + 4NH3 + 2H2O}\]
Addition of sodium bisulphite to ethanol is ____________ type of reaction.
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 represents the structure of isopropyl methyl ketone?
Which of the following does not give yellow solid on treatment with sodium hypoiodlte?
In Clemmensen's reaction, ketone gives ____________.
Acetone on Clemmensen reduction gives ____________.
The compound which does NOT undergo haloform reaction is ____________.
Which of the following will give positive iodoform test?
Which of the following carbonyl compounds does NOT undergo aldol condensation?
The formation of cyanohydrin from acetone is an example of ____________.
Predict the product Z in the following series of reactions.
\[\ce{Ethanoic acid ->[PCl5] X ->[C6H6][Anhydrous AlCl3] Y ->[i) CH3MgBr][H3O^+] Z}\]
\[\ce{CH3Br ->[KNC] (A) ->[H3O^+] (B) ->[PCl5] (C)}\] product (C) is:
In which case, chiral carbon is not generated by reaction with HCN.
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 ____________.
How will you convert benzaldehyde into the following compound?
Benzophenone
How will you convert benzaldehyde into the following compound?
α-hydroxy phenyl acetic acid
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 acetophenone from acetyl chloride?
How will you prepare ethane from sodium acetate?
Which of the following compound will show a positive silver mirror test?
In the above reaction, product (B) is:
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.
Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.
How will you prepare acetic anhydride from acetic acid?
