Aldehydes Ketones and Carboxylic Acids — JEE Main PYQs

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: (see structure) can be easily reduced using $\mathrm{Zn}-\mathrm{Hg}/\mathrm{HCl}$ to (see structure)
Reason R: $\mathrm{Zn}-\mathrm{Hg}/\mathrm{HCl}$ is used to …

Consider the following reaction

Propanal+Methanal= …

Match List I with List II:
List-I (Name of reaction): A. Hell-Volhard-Zelinsky reaction B. Iodoform reaction C. Etard reaction D. Gatterman-Koch reaction
List-II (Reagent used): I. NaOH + I₂ II. (i) CrO₂Cl₂, CS₂ (ii) H₂O III. (i) Br₂/red phosphorus (ii) H₂O IV. CO, HCl, a …

The number of stereoisomers formed in a reaction of $(\pm )\mathrm{Ph}(\mathrm{C}=\mathrm{O})\mathrm{C}(\mathrm{OH})(\mathrm{CN})\mathrm{Ph}$ with HCN is ____.

Among the following marked proton of which compound shows lowest ${\mathrm{pK}}_{\mathrm{a}}$ value?

Which one of the following reactions does not represent correct combination of substrate and product under the given conditions?

An organic compound 'A' on reaction with NH₃ followed by heating gives compound B. Which on further strong heating gives compound C (C₈H₅NO₂). Compound C on sequential reaction with ethanolic KOH, alkyl chloride and hydrolysis with alkali gives a primary amine. The compound A is:

In the given reaction

(Where Et is $-{\mathrm{C}}_2{\mathrm{H}}_5$)

The number of chiral carbon/s in product A is

Consider the above reaction and predict the major product.

The structure of A in the given reaction is:

Match List-I with List-II.

List-I
(A) (see structure)
(B) (see structure)
(C) (see structure)
(D) (see structure)

List-II
(I) Gatterman Koch reaction
(II) Etard reaction
(III) Stephen reaction
(IV) Rosenmund reaction

Choose the correct answer from the options given below:

In the above reaction, 5 g of toluene is converted into benzaldehyde with 92% yield. The amount of benzaldehyde produced is ____ $\times 10^{-2}$ g. (Nearest integer)

What is the major product of the following reaction?

$\mathrm{CH}{}_3-\mathrm{CH}{}_2-\mathrm{CN}\underset{\text{Ether}}{\overset{\mathrm{CH}{}_3\mathrm{MgBr}}{\to }}\mathrm{A}\stackrel{\mathrm{H}{}_3\mathrm{O}{}^{+}}{\to }\mathrm{B}\underset{\text{HCl}}{\overset{\mathrm{Zn}-\mathrm{Hg}}{\to }}\mathrm{C}$

The correct structure of C is

The products formed in the following reaction, A and B are

Isobutyraldehyde on reaction with formaldehyde and ${\mathrm{K}}_2{\mathrm{CO}}_3$ gives compound 'A'. Compound 'A' reacts with KCN and yields compound 'B', which on hydrolysis gives a stable compound 'C'. The compound 'C' is :

The correct structure of product 'A' formed in the following reaction.

$\mathrm{PhCHO}+\mathrm{Ph}\cdot \mathrm{CHO}\underset{\mathrm{in}\mathrm{D}{}_2\mathrm{O}}{\overset{\mathrm{NaOD}}{\to }}\mathrm{A}+\mathrm{Ph}-\stackrel{\mathrm{O}}{\mathrm{C}}-\mathrm{O}{}^{-}$

(Ph is $-\mathrm{C}{}_6\mathrm{H}{}_5$)

In the given reaction,

The number of $\pi$ electrons present in the product ' P ' is ____.

Oxidation of toluene to Benzaldehyde can be easily carried out with which of the following reagents?

The reagent, from the following, which converts benzoic acid to benzaldehyde in one step is

The final product 'A' in the following reaction sequence

Given below are two statements:
Statement I: The esterification of carboxylic acid with an alcohol is a nucleophilic acyl substitution.
Statement II: Electron withdrawing groups in the carboxylic acid will increase the rate of esterification reaction.
Choose the most appropriate …

${\text{C}}_6{\text{H}}_{12}{\text{O}}_6\stackrel{\text{Zymase}}{\to }\text{A}\underset{\Delta }{\overset{\text{NaOI}}{\to }}\text{B}+{\text{CHI}}_3$

The number of carbon atoms present in the product B is ____.

Among the following structures, which will show the most stable enamine formation?
(Where Me is $-{\mathrm{CH}}_3$ )

Which of the following reactions will yield benzaldehyde as a product?

Given below are two statements:

Statements-I : In Hofmann degradation reaction, the migration of only an alkyl group takes place from carbonyl carbon of the amide to the nitrogen atom.

Statement-II : The group is migrated in Hofmann degradation reaction to electron deficient at …

Consider the above reaction sequence, the Product 'C' is:

'A' $(\mathrm{C}{}_8\mathrm{H}{}_6\mathrm{Cl}{}_2\mathrm{O})\stackrel{\mathrm{NH}{}_3}{\to }\mathrm{C}{}_8\mathrm{H}{}_8\mathrm{ClNO}\underset{\mathrm{NaOH}}{\overset{\mathrm{Br}{}_2}{\to }}$

Consider the above reaction, the compound 'A' is:

Two statements are given below:

Statement I: The melting point of monocarboxylic acid with even number of carbon atoms is higher than that of with odd number of carbon atoms acid immediately below and above it in the series.

Statement II: The solubility of monocarboxylic acids …

Hex-4-ene-2-ol on treatment with PCC gives 'A'. 'A' on reaction with sodium hypoiodite gives 'B', which on further heating with soda lime gives 'C'. The compound 'C' is

Which of the following conditions or reaction sequence will NOT give acetophenone as the major product?
(A) (a) (see structure)
(b) ${\mathrm{Na}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7,{\mathrm{H}}^{+}$
(B) (see structure)
(b) PCC, DCM
(C) (see structure)
(D) (see structure) …

Which of the following ketone will NOT give enamine on treatment with secondary amines? [where t-Bu is $-\mathrm{C}{\left({\mathrm{CH}}_3\right)}_3$]

The reaction of $\mathrm{R}-\mathrm{C}-{\mathrm{NH}}_2$ with bromine and KOH gives ${\mathrm{RNH}}_2$ as the end product. Which one of the following is the intermediate product formed in this reaction?

The major products formed in the following reaction sequence $\mathbf{A}$ and $\mathbf{B}$ are :

Consider the given reaction, Identify ' $X$ ' and ' $Y$ '

Consider the given reaction, the Product A is:

Which among the above compound/s does / do not form silver mirror when treated with Tollen's reagent?

The number of nitrogen atoms in a semicarbazone molecule of acetone is ____.

Match List - I and List - II

List - I
(a) (see structure)
(b) (see structure)
(c) (see structure)
(d) (see structure)

List - II
(i) ${\mathrm{Br}}_2/\mathrm{NaOH}$
(ii) ${\mathrm{H}}_2/\mathrm{Pd}-{\mathrm{BaSO}}_4$
(iii) $\mathrm{Zn}(\mathrm{Hg})/$ Conc. HCl
(iv) …

Which of the following reagent is suitable for the preparation of the product in the above reaction?

The correct order of their reactivity towards hydrolysis at room temperature is:

The major product (P) in the following reaction is:
(i) KOH alc.
(ii) ${\mathrm{H}}^{+},\Delta$ (major product)

Given below are two statements:
Statement I: Ethyl pent-4-yn-oate on reaction with ${\mathrm{CH}}_3\mathrm{MgBr}$ gives a $3^{\circ }$-alcohol.
Statement II: In this reaction one mole of ethyl pent-4-yn-oate utilizes two moles of ${\mathrm{CH}}_3\mathrm{MgBr}$.
In the light of t …

Which one of the following reactions will not yield propionic acid?

Compound(s) which will liberate carbon dioxide with sodium bicarbonate solution is/are:

$A=$ (see structure)

$B=$ (see structure)

$C=$ (see structure)

Which one of the following reactions will not form acetaldehyde?

The major product of the following chemical reaction is:

$\underset{\left({\mathrm{C}}_4{\mathrm{H}}_8{\mathrm{Cl}}_2\right)}{\mathrm{A}}\underset{373\mathrm{K}}{\overset{\text{ Hydrolysis }}{\to }}\underset{\left({\mathrm{C}}_4{\mathrm{H}}_8\mathrm{O}\right)}{\mathrm{B}}$

B reacts with Hydroxyl amine but does not give Tollen's test. Ident …

The structure of the starting compound $\mathbf{P}$ used in the reaction given below is:

Identify A in the following chemical reaction.