Aldehydes Ketones and Carboxylic Acids — JEE Main PYQs

2,4-DNP test can be used to identify :

1) Zn / HCl
2) Cr₂O₃, 773 K
10-20 atm

Considering the above reaction, the major product among the following is :

For the reaction given below :

(see structure)

The compound which is not formed as a product in the reaction is a :

The structure of product C , formed by the following sequence of reactions is :

The major products A and B in the following set of reactions are :

Which one of the following compounds will give orange precipitate when treated with 2,4-Dinitrophenyl hydrazine?

Mesityl oxide is a common name of:

Consider the given reaction, the product 'X' is:

Which one of the following compounds will liberate ${\mathrm{CO}}_2$, when treated with ${\mathrm{NaHCO}}_3$ ?

A reaction of benzonitrile with one equivalent ${\mathrm{CH}}_3\mathrm{MgBr}$ followed by hydrolysis produces a yellow liquid "P". The compound "P" will give positive ______.

$\mathrm{R}-\mathrm{CN}\underset{\text{ (ii) }{\mathrm{H}}_2\mathrm{O}}{\overset{\text{ (i) }\text{ DIBAL-H }}{\to }}\mathrm{R}-\mathrm{Y}$
Consider the above reaction and identify " Y "

In the following sequence of reactions,
(see reaction scheme)
The compounds $\mathbf{B}$ and $\mathbf{C}$ respectively are:

Given below are two statements:
Statement I: The nucleophilic addition of sodium hydrogen sulphite to an aldehyde or a ketone involves proton transfer to form a stable ion.
Statement II: The nucleophilic addition of hydrogen cyanide to an aldehyde or a ketone yields amine as fina …

Which of the following reaction DOES NOT involve Hoffmann bromamide degradation?

In the above reaction, the reagent "A" is:

In the reaction of hypobromite with amide, the carbonyl carbon is lost as:

Consider the above reaction, the product 'X' and 'Y' respectively are:

In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula ${\left[\mathrm{Ag}{\left({\mathrm{NH}}_3\right)}_2\right]}^{+}$ per aldehyde group to form silver mirror is ______.
(Round off to the nearest integer).

Consider the above reaction. The percentage yield of amide product is ______.
(Round off to the nearest integer).
(Given: Atomic mass: C:12.0u, H:1.0 u, N: $14.0\mathrm{u},\mathrm{O}:16.0\mathrm{u},\mathrm{Cl}:35.5\mathrm{u}$)

Consider the above chemical reaction and identify product "A":

Maleic anhydride can be prepared by: [structure of maleic anhydride shown in source]

Br-C₆H₄-CHO reacts with EtOH (excess)/dry HCl gas to give major product 'A', which on treatment with t-BuO⁻K⁺ gives major product 'B'. Consider the above reaction sequence; products 'A' and 'B' formed respectively are: [structural options shown in source]

A solution of m-chloroaniline, m-chlorophenol and m-chlorobenzoic acid in ethyl acetate was extracted initially with a saturated solution of ${\mathrm{NaHCO}}_3$ to give fraction A. The left over organic phase was extracted with dilute NaOH solution to give fraction B. The fina …

The most suitable reagent for the given conversion is :

Identify (A) in the following reaction sequence:

The increasing order of the reactivity of the following compounds in nucleophilic addition reaction is:
Propanal, Benzaldehyde, Propanone, Butanone

The correct match between Item-I (starting material) and Item-II (reagent) for the preparation of benzaldehyde is:

Item-I
(I) Benzene
(II) Benzonitrile
(III) Benzoyl Chloride

Item-II
(P) $\mathrm{HCl}$ and ${\mathrm{SnCl}}_2,{\mathrm{H}}_3{\mathrm{O}}^{+}$
(Q) …

The increasing order of the acidity of the $\alpha$-hydrogen of the following compounds is:

(A) (see structure)
(B) (see structure)
(C) (see structure)
(D) (see structure)

An organic compound (A) (molecular formula ${\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_2$) was hydrolysed with dil. ${\mathrm{H}}_2{\mathrm{SO}}_4$ to give a carboxylic acid (B) and an alcohol (C). 'C' gives white turbidity immediately when treated with anhydrous …

An organic compound neither reacts with neutral ferric chloride solution nor with Fehling solution. It however, reacts with Grignard reagent and gives positive iodoform test. The compound is:

The major product obtained in the following reaction is:

The major product of the following reaction is :

Which diccarboxylic acid in presence of a dehydrating agent is least reactive to give anhydride?

The decreasing order of ease of alkaline hydrolysis for the following ester is

The major product 'X' formed in the following reaction is:

Which of the following compounds reacts with ethylmagnesium bromide and also decolourizes bromine water solution:

The major product 'Y' in the following reaction is:-

Compound A $\left({\mathrm{C}}_9{\mathrm{H}}_{10}\mathrm{O}\right)$ shows positive iodoform test. Oxidation of A with ${\mathrm{KMnO}}_4/\mathrm{KOH}$ gives acid $\mathrm{B}\left({\mathrm{C}}_8{\mathrm{H}}_6{\mathrm{O}}_4\right)$. Anhydride of B is used for the preparation of …

In the following reaction

Aldehyde + Alcohol $\stackrel{\mathrm{HCl}}{\to }$ Acetal
Aldehyde Alcohol
HCHO ${}^t$BuOH
$\mathrm{CH}{}_3\mathrm{CHO}$ MeOH
The best combination is

In the following reactions, products A and B are:

The aldehydes which will not form Grignard product with one equivalent Grignard reagents are:

The increasing order of the reactivity of the following with ${\mathrm{LiAlH}}_4$ is :
(a)
(see structure)
(b)
(see structure)
(c)
(see structure)
(d)
(see structure)

The major products A and B for the following reactions are, respectively

In the following reaction

Carbonyl compound $+\mathrm{MeOH}\stackrel{\mathrm{HCl}}{\rightleftharpoons }$ acetal
Rate of the reaction is the highest for:

The tests performed on compound $X$ and their inferences are:

\begin{tabular}{lcl}
& \multicolumn{1}{c}{ Test } & \multicolumn{1}{c}{ Interference } \\
(a) & 2, 4-DNP test & Colorued precipitate \\
(b) & Iodoform test & Yellow precipitate \\
(c) & Azo-dye test & No dye formati …

The correct decreasing order for acidic strength is

The major product of the following reaction is

Major products of the following reaction are:

The correct sequence of reagents for the following conversion will be :

In the Hofmann bromamide degradation reaction, the number of moles of NaOH and ${\mathrm{Br}}_2$ used per mole of amine produced are: