Aldehydes Ketones and Carboxylic Acids — JEE Main PYQs

The product © in the following sequence of reactions has ______ $\pi$ bonds.

Which among the following aldehydes is most reactive towards nucleophilic addition reactions?

The major product of the following reaction is P.

Number of oxygen atoms present in product 'P' is ______ (nearest integer).

Consider the given reaction, identify the major product P.

Consider the following reactions
$\mathrm{NiS}+{\mathrm{HNO}}_3+\mathrm{HCl}\to \mathrm{A}+\mathrm{NO}+\mathrm{S}+{\mathrm{H}}_2\mathrm{O}$

The number of protons that do not involve in hydrogen bonding in the product B is ______.

The correct sequence of acidic strength of the following aliphatic acids in their decreasing order is :
${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{COOH},{\mathrm{CH}}_3\mathrm{COOH},{\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{COOH}$, HCOOH

Two moles of benzaldehyde and one mole of acetone under alkaline conditions using aqueous NaOH after heating gives $x$ as the major product. The number of $\pi$ bonds in the product $x$ is

Identify the product $(\mathrm{P})$ in the following reaction:

i) ${\mathrm{Br}}_2/\mathrm{Red}\mathrm{P}$
ii) ${\mathrm{H}}_2\mathrm{O}$

Which of the following compound can give positive iodoform test when treated with aqueous KOH solution followed by potassium hypoiodite.

Major product of the following reaction is

Which of the following compounds will give silver mirror with ammoniacal silver nitrate?
(A) Formic acid
(B) Formaldehyde
(C) Benzaldehyde
(D) Acetone

Choose the correct answer from the options given below :

Which of the following has highly acidic hydrogen?

The final product A formed in the following multistep reaction sequence is

From the compounds given below, number of compounds which give positive Fehling's test is ____.

Benzaldehyde, Acetaldehyde, Acetone, Acetophenone, Methanal, 4-nitrobenzaldehyde, cyclohexane carbaldehyde.

Identify the reagents used for the following conversion

This reduction reaction is known as:

Sugar which does not give reddish brown precipitate with Fehling's reagent is:

In the given reactions identify the reagent A and reagent B

The compound formed by the reaction of ethanal with semicarbazide contains ______ number of nitrogen atoms.

Identify the name reaction.

m-chlorobenzaldehyde on treatment with $50\%$ KOH solution yields

Among the following, the number of compounds which will give positive iodoform reaction is ____

(a) 1-Phenylbutan-2-one
(b) 2-Methylbutan-2-ol
(c) 3-Methylbutan-2-ol
(d) 1-Phenylethanol
(e) 3,3-dimethylbutan-2-one
(f) 1-Phenylpropan-2-ol

Major product 'P' formed in the following reaction is :-

The descending order of acidity for the following carboxylic acid is :
A. ${\mathrm{CH}}_3\mathrm{COOH}$
B. ${\mathrm{F}}_3\mathrm{C}-\mathrm{COOH}$
C. ${\mathrm{ClCH}}_2-\mathrm{COOH}$
D. ${\mathrm{FCH}}_2-\mathrm{COOH}$
E. ${\mathrm{BrCH}}_2-\mathrm{COOH}$

Choose t …

The major product formed in the following reaction is:

(i) $\underset{\text{ EtOH }}{\overset{{\mathrm{LiBH}}_4}{\to }}$ major product
(ii) ${\mathrm{H}}_3{\mathrm{O}}^{+}$

'A' and 'B' in the below reactions are :

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 subjected to Wolff-Kishner reduction to give (see structure)

Reason R : Wolff-Kishner reduction is used to convert (see structure) into (se …

The major product formed in the following reaction is:
(see reaction scheme)
(A) (see structure)
(B) (see structure)
(C) (see structure)
(D) (see structure)

Choose the correct answer from the options given below :

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : A solution of the product obtained by heating a mole of glycine with a mole of chlorine in presence of red phosphorous generates chiral carbon atom.

Reason R : A …

Correct statements for the given reaction are :

Squaric acid $\stackrel{\text{2 eq. base}}{\to }$ 'B' (aromatic dianion)

A. Compound 'B' is aromatic
B. The completion of above reaction is very slow
C. 'A' shows tautomerism
D. The bond lengths C–C in compound B are found to be sa …

A in the above reaction is :

The major product ' P ' formed in the following sequence of reactions is
'P' (Major Product)

The mass of ${\mathrm{NH}}_3$ produced when 131.8 kg of cyclohexanecarbaldehyde undergoes Tollen's test is $\_\_\_\_$ kg. (Nearest Integer)

Molar Mass of $\mathrm{C}=12\mathrm{g}/\mathrm{mol}$
$\mathrm{N}=14\mathrm{g}/\mathrm{mol}$ …

In the reaction given below
' A ' is

major product 'A' formed in the above reaction is

In the following reaction, ' $A$ ' is

Compound (X) undergoes the following sequence of reactions to give the Lactone (Y): (i) HCHO, KOH (ii) KCN (alc.) (iii) H3O+. The Lactone (Y) is a five-membered gamma-butyrolactone bearing a gem-dimethyl group and an alpha-hydroxy group (alpha-hydroxy-beta,beta-dimethyl-gamma-b …

'R' formed in the following sequence of reaction is:

Given below are two statements :

Statement I :

under Clemmensen reduction conditions will give HOOC .

Statement II :

under Wolff-Kishner reduction condition will give

In the light of the above statements, choose the correct answer from the options given below :

Which will undergo deprotonation most readily in basic medium?

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:
Assertion A: Acetal/Ketal is stable in basic medium.
Reason R: The high leaving tendency of alkoxide ion gives the stability to acetal/ketal in basic medium.

In the light of the …

'A' in the given reaction is

Number of compounds giving (i) red colouration with ceric ammonium nitrate and also (ii) positive iodoform test from the following is ____

The major product 'P' for the following sequence of reactions is:
(see reaction scheme)

Find out the major products from the following reaction sequence.

Reaction of propanamide with ${\mathrm{Br}}_2/\mathrm{KOH}(\mathrm{aq})$ produces :

What is the correct order of acidity of the protons marked A-D in the given compounds?

In a reaction,

reagents ' X ' and ' Y ' respectively are :

The structures of major products $\mathrm{A},\mathrm{B}$ and C in the following reaction are sequence.

The number of molecules which gives haloform test among the following molecules is ____.