Aldehydes Ketones and Carboxylic Acids — JEE Main PYQs

An organic compound "P" of molecular formula ${\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_3$ gives positive iodoform test but negative Tollen's test. When "P" is treated with dilute acid, it produces "Q". "Q" gives positive Tollen's test and also iodoform test. The structure of …

Match List-I with List-II.

List-I (Reaction Name - Involving aldehydes):
I. Etard Reaction
II. Rosenmund Reduction
III. Gatterman-Koch Reaction
IV. Stephen Reaction

List-II (Reagents):
A. ${\mathrm{H}}_2$, Pd-${\mathrm{BaSO}}_4$
B. ${\mathrm{SnCl}}_2$, HCl
C. …

The compound A, ${\mathrm{C}}_8{\mathrm{H}}_8{\mathrm{O}}_2$ reacts with acetophenone to form a single product via cross-Aldol condensation. The compound A on reaction with conc. NaOH forms a substituted benzyl alcohol as

' $x$ ' is the product which is obtained from propanenitrile and stannous chloride in the presence of hydrochloric acid followed by hydrolysis. ' y ' is the product which is obtained from the but-2-ene by the ozonolysis followed by hydrolysis. From the following, which product is …

From the given following (A to D) cyclic structures, those which will not react with Tollen's reagent are :

Iodoform test can differentiate between
A. Methanol and Ethanol
B. ${\mathrm{CH}}_3\mathrm{COOH}$ and ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{COOH}$
C. Cyclohexene and cyclohexanone
D. Diethyl ether and Pentan-3-one
E. Anisole and acetone

Choose the correct answer from the …

Which of the following statements are TRUE about Haloform reaction?
A. Sodium hypochlorite reacts with KI to give KOI.
B. KOI is a reducing agent.
C. $\alpha ,\beta$-unsaturated methylketone will give iodoform reaction.
D. Isopropyl alcohol will not give iodoform test.
E. Metha …

A student is given one compound among the following compounds that gives positive test with Tollen's reagent.

The compound is :

A hydroxy compound (X) with molar mass 122 g ${\mathrm{mol}}^{-1}$ is acetylated with acetic anhydride, using a large excess of the reagent ensuring complete acetylation of all hydroxyl groups. The product obtained has a molar mass of $290\mathrm{g}{\mathrm{mol}}^{-1}$. The numbe …

The unsaturated ether on acidic hydrolysis produces carbonyl compounds as shown below:-
${\mathrm{CH}}_3-{\mathrm{CH}}_2-\mathrm{CH}=\mathrm{O}$ and $\mathrm{O}=\mathrm{CH}-{\mathrm{CH}}_3$
Based on this, predict the solution / reagent that will help to distinguish "P" and "Q" ob …

Given below are two statements:

Statement I: Cross aldol condensation between two different aldehydes will always produce four different products.

Statement II: When semicarbazide reacts with a mixture of benzaldehyde and acetophenone under optimum pH, it forms a condensation p …

Given below are two statements for the following reaction sequence.

Statement I: Compound ' $Z$ ' will give yellow precipitate with NaOI.

Statement II: Compound 'Q' has two different types of ' H ' atoms (aromatic : aliphatic) in the ratio 1 : 3 .

In the light of the above s …

Given below are the four isomeric compounds (P, Q, R, S)

(P)

(Q) (see structure)

(R)

(S)

Identify correct statements from below.
A. $Q,R$ and $S$ will give precipitate with 2, 4 - DNP.
B. P and Q will give positive Bayer's test.
C. Q and R will give sooty flame.
D. R an …

Consider the following reactions giving major product. Identify the correct reaction.

The correct order of acidic strength of the major products formed in the given reactions, is:
A. …

An organic compound " x " where molar ratio of C , O and H are equal, on treatment with $50\%\mathrm{KOH}$ under reflux followed by acidification produced " y ". The most likely structure of " y " is:
[Molar mass of ' x ' is $58\mathrm{g}{\mathrm{mol}}^{-1}$ ]

A molecule ( X ) with following structure under mild acidic condition is hydrolysed to produce (Y) and (Z). Identify the correct statements about (Y) and (Z).

(X)

(A) Both (Y) and (Z) have same molar mass
(B) (Y) and (Z) can be distinguished from each other by …

Complete the following reaction sequence and give the name of major product 'P'.

Given below are two statements :

Statement-I : The condensation reaction between CH₃-CH=O and (see structure) under optimum pH will produce (see structure)

Statement-II : The molecule, (see structure) will generate Ph-CH=O in the presence of dilute acid.

In the light of the ab …

'x' is the product which is obtained by the hydrolysis of prop-1-yne in the presence of mercuric sulphate under dilute acidic medium at 333 K. 'y' is the product which is obtained by the reaction of ethane nitrile with methyl magnesium bromide in dry ether followed by hydrolysis. …

An optically active alkyl bromide C₄H₉Br, reacts with ethanolic KOH to form major compound [A] which reacts with bromine to give compound [B]. Compound [B] reacts with ethanolic KOH and sodamide to give compound [C]. One molecule of water adds to compound [C] on warming with merc …

Consider the following reactions. Total number of electrons in the π bonds and lone pair of electrons in the product (X) is:

(see structure)

Consider the following reaction.

(see reaction scheme)

The major product (P) formed is :

Which statements are True?
(A) In Hoffmann bromamide degradation, 4 moles of NaOH and 2 moles of ${\mathrm{Br}}_2$ are consumed per mole of an amide
(B) Hoffmann bromamide reaction is not given by alkyl amides.
(C) Primary amines can be synthesized by Hoffmann bromamide degradati …

'x' is the product which is obtained from benzene by reacting it with carbon monoxide and hydrogen chloride in the presence of cuprous chloride. 'y' is the major product obtained from the benzene by reacting it with ethanoyl chloride in the presence of anhydrous …

The compounds which give positive Fehling's test are :
(A)
(B)
(C) ${\mathrm{HOCH}}_2-\mathrm{CO}-(\mathrm{CHOH}{)}_3-{\mathrm{CH}}_2-\mathrm{OH}$
(D)
(E)

Choose the CORRECT answer from the options given below :

Which of the following arrangements with respect to their reactivity in nucleophilic addition reaction is correct?

Aman has been asked to synthesise the molecule

(x) • He thought of preparing the molecule using an aldol condensation reaction. He found a few cyclic alkenes in his laboratory. He thought of performing ozonolysis reaction on alkene to produce a dicarbonyl compound followed by al …

Match List-I with List-II

List-I
(A) $\mathrm{RCN}\underset{\text{ (ii) }{\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{\text{(i) }{\mathrm{SnCl}}_2,\mathrm{HCl}}{\to }}\mathrm{RCHO}$
(B) (see structure)
(C) (see structure)
(D) (see structure)

List-II
(I) Etard reaction
(II) Gatterman -Ko …

The major product of the following reaction is:

Both acetaldehyde and acetone (individually) undergo which of the following reactions?
A. Iodoform Reaction
B. Cannizaro Reaction
C. Aldol condensation
D. Tollen's Test
E. Clemmensen Reduction

Choose the correct answer from the options given below:

The compounds that produce ${\mathrm{CO}}_2$ with aqueous ${\mathrm{NaHCO}}_3$ solution are :
A.
B.
C.
D.
E.

Choose the correct answer from the options given below :

Given below are two statements:

Consider the following reaction

Statement (I): In the case of formaldehyde, K is about 2280, due to small substituents, hydration is faster.

Statement (II): In the case of trichloroacetaldehyde, K is about 2000 due to -I effect of -Cl.

In the l …

The product (P) formed in the following reaction is:

In the Claisen-Schmidt reaction to prepare, dibenzalacetone from 5.3 g benzaldehyde, a total of 3.51 g of product was obtained. The percentage yield in this reaction was ______ %.

Given below are two statements :
Statement (I) : Vanillin (see structure) will react with NaOH and also with Tollen's reagent.
Statement (II) : (see structure) will undergo self aldol condensation very easily.
In the light of the above statements, choose the most appropriate answ …

Consider the following molecules :

The correct order of rate of hydrolysis is :

Consider the following reactions. From these reactions which reaction will give carboxylic acid as a major product?
(A) $\mathrm{R}-\mathrm{C}\equiv \mathrm{N}\underset{\text{ mild condition }}{\overset{\text{ (i) }{\mathrm{H}}^{+}/{\mathrm{H}}_2\mathrm{O}}{\to }}$
(B) …

Number of molecules from below which cannot give ioddoform reaction is :
Ethanol, Isopropyl alcohol, Bromoacetone, 2-Butanol, 2-Butanone, Butanal, 2-Pentanone, 3-Pentanone, Pentanal and 3-Pentanol

Which among the following compounds give yellow solid when reacted with $\mathrm{NaOI}/\mathrm{NaOH}$ ?
(A)
(B) ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{OH}$
(C)
(D)
(E)

Choose the correct answer from the options given below :

A toxic compound "A" when reacted with NaCN in aqueous acidic medium yields an edible cooking component and food preservative 'B'. "B" is converted to "C" by diborane and can be used as an additive to petrol to reduce emission. "C" upon reaction with oleum at …

Aldol condensation is a popular and classical method to prepare $\alpha ,\beta$-unsaturated carbonyl compounds. This reaction can be both intermolecular and intramolecular. Predict which one of the following is not a product of intramolecular aldol condensation?

An organic compound (X) with molecular formula ${\mathrm{C}}_3{\mathrm{H}}_6\mathrm{O}$ is not readily oxidised. On reduction it gives ( ${\mathrm{C}}_3{\mathrm{H}}_8\mathrm{O}(\mathrm{Y})$ which reacts with HBr to give a bromide (Z) which is converted to Grignard reagent …

" P " is an optically active compound with molecular formula ${\mathrm{C}}_6{\mathrm{H}}_{12}\mathrm{O}$. When " P " is treated with 2,4-dinitrophenylhydrazine, it gives a positive test. However, in presence of Tollens reagent, "P" gives a negative test. Predict the structure of …

Which of the following compounds is least likely to give effervescence of ${\mathrm{CO}}_2$ in presence of aq. ${\mathrm{NaHCO}}_3$ ?

When (see structure) undergoes intramolecular aldol condensation, the major product formed is:

Given below are two statements:

Statement I: Acidity of $\alpha$-hydrogens of aldehydes and ketones is responsible for Aldol reaction.

Statement II : Reaction between benzaldehyde and ethanal will NOT give Cross - Aldol product. In the light of above statements, choose the mo …

Identify the product in the following reaction :

Identify ' A ' in the following reaction :

In the Claisen-Schmidt reaction to prepare 351 g of dibenzalacetone using 87 g of acetone, the amount of benzaldehyde required is ______ g. (Nearest integer)