WBJEE: Short notes & important Questions for Aldehydes, Ketones and Carboxylic Acids

After the detailed analysis of the latest syllabus and few last years’ papers of WBJEE entrance examination, Subject Experts of Chemistry have prepared the notes of chapter Aldehydes, Ketones and Carboxylic Acid to boost your preparation.

These notes contain all important topics related to Aldehydes, Ketones and Carboxylic Acid like preparation, physics properties and chemical properties.

The mechanisms of some name reactions like Rosenmund reduction, Stephen reaction, Etard reaction, Gatterman - Koch reaction, Friedel-Crafts acylation, Canninzzaro reaction, Hell-Volhard-Zelinsky reaction are also explained here.

Name Reactions Asked in CBSE & IIT JEE Exams: Last 5 years Analysis

Important Concepts:

WBJEE: Important Questions and Preparation Tips for Thermodynamics (Part 1)

 

WBJEE: Important Questions and Preparation Tips for Alcohol

WBJEE: Important Questions and Preparation Tips – Chemical Kinetics, (Part 1)

WBJEE: Important Questions and Preparation Tips –Periodic Classification & Periodicity in Properties

WBJEE: Important Questions and Preparation Tips – States of Matter

Some solved questions are given below:

Question 1:

Amongst the following compounds, the one that will not respond to Cannizzaro reaction upon treatment with alkali is

(A)  Cl3CCHO

(B) Me3CCHO

(C) C6H5CHO

(D) HCHO

Solution 1:

Cl3CCHO formation is the 2nd last step in the haloform reaction mechanism. Hence on treatment with caustic alkali, Cl3CCHO is hydrolysed and does not disproportionate.

Hence, the correct option is (A).

WBJEE: Important Questions and Preparation Tips – Electrochemistry

Question 2:

Solution 2:

This is an intramolecular Cannizzaro’s reaction.

Hence, the correct option is (A).

WBJEE: Important Questions and Preparation Tips – Solutions

Question 3:

Which of the following reactions will not result in the formation of carbon–carbon bonds?

(a) Cannizaro reaction

(b) Wurtz reaction

(c) Reimer-Tiemann reaction

(d) Friedel-Crafts acylation

Solution 3:

Wurtz reaction, Reimer-Tiemann reaction, Friedel-Crafts acylation result in the formation of C-C bond while Cannizaro reaction do not form Carbon-Carbon bond.

Hence, the correct option is (a).

WBJEE: Important Questions and Preparation Tips – Equilibrium

Question 4:

The major products obtained during ozonolysis of 2, 3 – dimethyl-1-butene and subsequent reductions with Zn and H2O are

(a) Methanoic acid and 2-methyl-2-butanone

(b) Methanal and 3-methyl-2-butanone

(c) Methanol and 2,2-dimethyl-3-butanone

(d) Methanoic acid and 2-methyl-3-butanone

Solution 4:

Conclusion:

These notes contain the crux of the chapter Aldehydes, Ketones and Carboxylic Acid. With the help of these notes aspirants can easily understand the mechanisms of all important name reactions related to this chapter. It will also help in saving precious time of engineering aspirants.

WBJEE 2018: Notification, Application, Dates, Eligibility, Exam Pattern, Syllabus

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