List of top Chemistry Questions on Aldehydes, Ketones and Carboxylic Acids

An organic compound (A) has molecular formula C$_8$H$_8$O. It gives an orange-red precipitate with 2,4-dinitrophenylhydrazine (2,4-DNP) and a yellow precipitate on heating with iodine in the presence of NaOH. It does not reduce Tollens' reagent or Fehling's solution and does not decolourise Br$_2$-water/Baeyer's reagent. On strong oxidation with chromic acid it forms a carboxylic acid (B) of formula C$_7$H$_6$O$_2$. Identify (A) and (B).
Explain Cannizzaro reaction with chemical equation.
Reagent, which do not react with acetone and benzaldehyde:
Write chemical equations for obtaining carboxylic acid from the following:
Fehling’s solution is used to identify which type of compounds? Write chemical equations.
Write a note on Tollen’s test.
What is Layer's test?
For an SN2 reaction, arrange the following alkyl halides in increasing order of reactivity:
(A) CH3CH2CH2CH2
(B) CH3CH2CH(Br)CH3
(C) (CH3)3
(D) (CH3)2CHCH2
Identify compound (Z) in the following reaction sequence.
Reaction
The molecular formula of second homologue in the homologous series of monocarboxylic acid is
The correct structure of dipeptide, Gly-Ala (glycyl alanine) is:

The increasing order of acidity of the following compounds based on pKa values:
(A) BrCH$_2$COOH
(B) ClCH$_2$COOH
(C) FCH$_2$COOH
(D) HCOOH

In the Etard reaction, the final product is
Arrange the following acids in increasing order of their acidic strengths: HCOOH, FCH₂COOH, NO₂CH₂COOH, ClCH₂COOH
What is the color of copper compound formed in Fehling’s test for aliphatic aldehydes?
What is the product when glucose reacts with bromine water?
Which of the following compounds will give the Hell-Volhard-Zelinsky reaction?
What is the correct IUPAC name of the given compound?
correct IUPAC name of the given compound

The products of the following reactions \( X \) and \( Y \) respectively are Reaction: 

Assertion (A): Aldehydes are more reactive than ketones towards nucleophilic addition reactions.
Reason (R): In aldehydes, the carbonyl carbon is less electrophilic compared to ketones.
In the following reaction sequence, what are X and Y respectively?
nucleophilic addition of a methoxy group
Which of the following sequence of reagents convert benzaldehyde to 4-chlorotoluene?
The diffraction pattern of a crystalline solid gave a peak at \( 2\theta = 60^\circ \). Its ‘d’ value is 1.54 Å. What is the wavelength (in cm) of X-rays used?
The pK\(_a\) values of X, Y, Z respectively are 8.3, 7.1, 10.2. What are X, Y, Z?

Identify the set, in which X and Y are correctly matched: