CBSE Class 12 · 2011 · Delhi · Aldehydes Ketones and Carboxylic AcidsVery Short Answer

Draw the structure of the major product of the reaction shown in the figure (part a).

(a) An organic compound (A) with the molecular formula C₉H₁₀O forms a 2,4-DNP derivative, reduces Fehling solution and undergoes Cannizzaro reaction. On vigorous oxidation it gives benzene-1,2-dicarboxylic acid.
(i) Identify compound (A) and write its IUPAC name.
(ii) Write the r …

(b)(i) Account for the following:
(1) The alpha (α) hydrogens of aldehydes and ketones are acidic in nature.
(2) Oxidation of aldehydes is easier than that of ketones.
(ii) Arrange the following:
(1) decreasing reactivity towards nucleophilic addition: propanal, acetone, benzalde …

Which one of the following has the lowest pKₐ value?

Assertion (A): Bromination of benzoic acid gives m-bromobenzoic acid.
Reason (R): The carboxyl group increases the electron density at the meta position.

(a)(i) Write the reaction involved in Cannizzaro's reaction.
(ii) Why are the boiling points of aldehydes and ketones lower than those of the corresponding carboxylic acids?
(iii) An organic compound 'A' with molecular formula C₅H₈O₂ is reduced to n-pentane with hydrazine followe …