Consider the following reaction Propanal + Methanal = → ( ii ) Δ ( iii ) NaCN ( iv ) H 3 O + ( i ) dil . NaOH P roduct B ( C 5 H 8 O 3 ) The correct statement for product B is. It is

racemic mixture and gives a gas with saturated NaHCO 3 solution

optically active and adds one mole of bromine

optically active alcohol and is neutrall

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: can be easily reduced using Zn - Hg / HCl to Reason R: Zn - Hg / HCl is used to reduce carbonyl group to – CH 2 – group. In the light of the above statements, choose the correct answer from the options given below:

Both A and R are true but R is not the correct explanation of A

Both A and R are true and R is the correct explanation of A

HARD

JEE Main

IMPORTANT

Earn 100

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

83.33% studentsanswered this correctly

Important Questions on Aldehydes, Ketones and Carboxylic Acids

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 26 - Aldehydes, Ketones and Carboxylic Acids>JEE Main - 28 June 2022 Shift 1>Q 114

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

Question Image

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 26 - Aldehydes, Ketones and Carboxylic Acids>JEE Main - 28 June 2022 Shift 2>Q 115

Isobutyraldehyde on reaction with formaldehyde and

K_{2} {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

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 26 - Aldehydes, Ketones and Carboxylic Acids>JEE Main - 29 June 2022 Shift 1>Q 116

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 option

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 26 - Aldehydes, Ketones and Carboxylic Acids>JEE Main - 29 June 2022 Shift 2>Q 117

Two isomers

(A)

and

(B)

with Molar mass

184 g / mol

and elemental compositio

C, 52.2 %; H, 4.9 %

and

Br 42.9 %

gave benzoic acid and

p -

bromobenzoic acid, respectively on oxidation with

{KMnO}_{4}

. Isomer

' A'

is optically active and gives a pale yellow precipitate when warmed with alcoholic

{AgNO}_{3}

. Isomer

' A'

and

' B'

are, respectively :

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 26 - Aldehydes, Ketones and Carboxylic Acids>JEE Main - 29 June 2022 Shift 2>Q 118

In the given reaction,

Question Image

The number of $π$ electrons present in the product $' P'$ is ____________.

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 26 - Aldehydes, Ketones and Carboxylic Acids>JEE Main - 25 July 2022 Shift 1>Q 119

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

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 26 - Aldehydes, Ketones and Carboxylic Acids>JEE Main - 25 July 2022 Shift 1>Q 120

In the given reaction

Question Image

(Where Et is $- C_{2} H_{5}$ )

The number of chiral carbon/s in product $A$ is

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 26 - Aldehydes, Ketones and Carboxylic Acids>JEE Main - 25 July 2022 Shift 2>Q 121

What is the major product of the following reaction?

Question Image

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

Important Questions on Aldehydes, Ketones and Carboxylic Acids

Learn and Prepare for any exam you want !