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Science (English Medium) Class 12 - CBSE Important Questions for Chemistry

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Chemistry
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Arrange the following in order of increasing boiling point:

Ethoxyethane, Butanal, Butanol, n-butane

Appears in 3 question papers
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Physical and Chemical Properties of Alcohols and Phenols

How can phenol be prepared from anisole? Give reaction.

Appears in 3 question papers
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Chemical Properties of Phenol

Distinguish between:

C6H5-COCH3 and C6H5-CHO

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones >> Chemical Reactions of Aldehydes and Ketones - Oxidation

Write the chemical reaction involved in Wolff-Kishner reduction.

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones >> Chemical Reactions of Aldehydes and Ketones - Reduction

Write the chemical equation for the reaction involved in Cannizzaro reaction.

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones >> Chemical Reactions of Aldehydes and Ketones - Other Reactions

Why pKa of F-CH2-COOH is lower than that of Cl−CH2−COOH?

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Acids >> Chemical Reactions of Carboxylic Acids - Reactions Involving Cleavege of O-H Bond

Write the product in the following reaction:

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones >> Preparation of Aldehydes

How can you distinguish between propanal and propanone?

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Introduction of Aldehydes, Ketones and Carboxylic Acids

Name the reagents used in the following reactions:

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Acids >> Methods of Preparation of Carboxylic Acids

Predict the products of the following reactions :

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones >> Chemical Reactions of Aldehydes and Ketones - Reduction

Predict the products of the following reactions :

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones >> Chemical Reactions of Aldehydes and Ketones - Oxidation

Predict the products of the following reactions :

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Acids >> Chemical Reactions of Carboxylic Acids - Reactions Involving –COOH Group

Draw the structures of major monohalo products in each of the following reactions :

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Acids >> Chemical Reactions of Carboxylic Acids - Reactions Involving Cleavege of C-OH Bond

Write the products formed when CH3CHO reacts with the following reagents : HCN

 

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones >> Chemical Reactions of Aldehydes and Ketones - Nucleophilic Addition Reactions

Write the products formed when CH3CHO reacts with the following reagents : H2N – OH

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones >> Chemical Reactions of Aldehydes and Ketones - Nucleophilic Addition Reactions

Write the products formed when CH3CHO reacts with the following reagents: CH3CHO in the presence of dilute NaOH

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones >> Chemical Reactions of Aldehydes and Ketones - Reactions Due to α-hydrogen

Account for the following : Cl – CH2COOH is a stronger acid than CH3COOH.

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Acids >> Chemical Reactions of Carboxylic Acids - Substitution Reactions in the Hydrocarbon Part

Out of CH3CH2 – CO – CH2 – CH3 and CH3CH2 – CH2 – CO – CH3, which gives iodoform test?

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones >> Chemical Reactions of Aldehydes and Ketones - Oxidation

An organic compound (A) (molecular formula C8H16O2) was hydrolysed with dilute sulphuric acid to give a carboxylic acid (B) and an alcohol (C). Oxidation of (C) with chromic acid produced (B). (C) on dehydration gives but-1-ene. Write equations for the reactions involved.

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Acids >> Methods of Preparation of Carboxylic Acids

Give a simple chemical test to distinguish between the following pair of compounds:

Benzaldehyde and Acetophenone

Appears in 3 question papers
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones >> Chemical Reactions of Aldehydes and Ketones - Oxidation
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