Advertisements
Advertisements
Question
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.
\[\ce{R-CHO + 2Ag(NH_{3})^{+}_{2} + OH^{-}->[\triangle] R-CO{O}^{-} + 2Ag↓ + 4NH3 + 2H2O}\]
Advertisements
Solution
When an aldehyde is boiled with Tollens' reagent, it gets oxidized to carboxylate ion and Ag+ ion is reduced to silver (Ag). The oxidation number of carbon in aldehyde increases while the oxidation number of Ag decreases. Hence, this is a redox reaction.
APPEARS IN
RELATED QUESTIONS
_____________ reaction is used to synthesize straight alkyl substituted benzenes.
The following compounds will give positive Fehling’s test.
Explain haloform reaction with suitable example.
Write reactions for the action of the following reagents on p-chlorobenzaldehyde.
Tollen’s reagent
Identify B in the following reaction,
\[\ce{Acetaldoxime ->[Na][alcohol] A ->[NaNO2][HCl] B + H2O + N2\uparrow}\]
An aldehyde or ketone reacts with hydrogen cyanide to form corresponding cyanohydrin derivatives. This reaction is an example of ____________.
Which of the following represents the structure of isopropyl methyl ketone?
In Clemmensen's reaction, ketone gives ____________.
Acetone on Clemmensen reduction gives ____________.
Following reaction is an example of ____________.
\[\ce{Benzaldehyde ->[Nitration] {m}-Nitrobenzaldehyde}\]
Identify the product Y in the following series of reactions.
\[\ce{4-Nitrotoluene ->[(CH3CO)2O/CrO3][273 - 278 K] X ->[H3O^+][\Delta] Y}\]
The formation of cyanohydrin from acetone is an example of ____________.
Reaction of acetone with one of the following reagents involves nucleophilic addition followed by elimination of water. The reagent is:
\[\ce{CH3Br ->[KNC] (A) ->[H3O^+] (B) ->[PCl5] (C)}\] product (C) is:
‘B’ is:
Identify the product formed in the reaction.
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?
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their ____________.
How will you prepare acetic anhydride from acetic acid?
How will you prepare ethane from sodium acetate?
How will you prepare acetaldehyde from ethyne?
Primary nitroalkanes are obtained in good yield by oxidising aldoximes with the help of ______.
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.
Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.
Which from following tests confirms presence of aldehydic group in glucose?
