List of top Chemistry Questions on Aldehydes And Ketones asked in UP Board XII

Write short notes on the following:
(i) Etard Reaction
(ii) Gattermann–Koch Reaction
(iii) Cannizzaro’s Reaction
(iv) Aldol Condensation

What happens, when – (Give chemical equations only)
(i) Acetaldehyde reacts with Tollen’s reagent.
(ii) Formaldehyde reacts with NaOH.
(iii) Benzamide undergoes acidic hydrolysis.

Write the structural formula of benzaldehyde. Write chemical equations of the reaction of benzaldehyde with (A) NH$_2$NH$_2$, (B) Tollen’s reagent and (C) NaOH.

Write I.U.P.A.C. name of Acetaldehyde. Write chemical equations of its reaction with (A) NaHSO$_3$, (B) NaOH, (C) NH$_2$NH$_2$, and (D) HCN.

Benzyl alcohol is obtained from benzaldehyde by –

On Cannizzaro’s reaction formaldehyde forms:

An organic compound ‘A’ having molecular formula C$_8$H$_8$O, gives orange-red precipitate with 2,4-DNP (2,4-Dinitrophenylhydrazine) reagent. ‘A’ gives yellow precipitate on heating with iodine in presence of NaOH. ‘A’ neither reduces Tollen’s reagent, Fehling’s solution nor decolourises bromine water. It forms a carboxylic acid ‘B’ having molecular formula C$_7$H$_6$O$_2$, on strong oxidation with chromic acid. Identify compounds ‘A’ and ‘B’ and explain the main reactions.

How will you obtain (Give chemical equations only): (i) 4-hydroxy-4-methylpentan-2-one from propanone?
(ii) 3-hydroxybutanol from ethanol?
(iii) Butanoic acid from butanal?
(iv) Ethanoic anhydride from ethanoic acid?
(v) Phenyl ethanoic acid from benzyl alcohol?

Glucose or Aldehyde reacts with Tollen's reagent to form:

Cannizzaro’s reaction is exhibited by:

What happens when (Give chemical equations only): (i) Acetaldehyde reacts with dilute NaOH: