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CBSE 12th Standard Chemistry Subject Aldehydes , Ketones and Carboxylic Acids HOT Questions 2 Mark Questions 2021

Published on: 28/05/2021

QB365 Provides the HOT Question Papers for Class 12 Chemistry, and also provide the detail solution for each and every HOT Questions. HOT Questions will help to get more idea about question pattern in every exams and also will help to get more marks in Exams

Download CBSE Class 12th Standard CBSE Chemistry question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Chemistry

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Std: 12th Standard CBSE - Chemistry

chapter: - HOT Questions

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Questions:

Generic 2

2 x 2 = 4

Name the reagents you will use to bring about the following conversions.
a. Ethane nitrile to ethanal
b. But-2-ene to ethanal

Fluorine is more electronegative than chlorine even then p-fluorobenzoic acid is a weaker acid than p-chlorobenzoic acid. Explain

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Answers Key:

Generic 2

2 x 2 = 4

a. Tertiary butyl ketone does not give precipitate with sodium bisulphate whereas acetone does.
b. Dialkyl cadmium is considered superior to grignard reagent for the preparation of a ketone from an acid chloride.

Since halogens are more electronegative than carbon and also possess lone pairs of electrons, therefore, they exert both -1- and +R- effects. Now in F, the lone pairs of electrons are present in 2p-orbitais but in CI, they are present in 3p-orbitals. Since 2p-orbitals of F and C are of almost equal size, therefore, the +Reffect is more pronounced in p fluorobenzoic acid than i~ip-chlorobenzoic acid.

Thus, in p-fluorobenzoic acid, +R-effect outweighs the -I-effect but is p-cWorobenzoic acid, it is the -1- effect which outweighs the +R-effect. Consequently, p-fluorobenzoic acid is a weaker acid than pchlorobenzoic acid.