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Science (English Medium) Class 12 - CBSE Important Questions

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Convert the following: 

Propanenitrile to ethanol.

Appears in 1 question paper
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Commercially Importance Alcohols

What happens when reactions:

N-ethylethanamine reacts with benzenesulphonyl chloride.

Appears in 1 question paper
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Methods of Preparation of Phenols

What happens when reactions:

Benzylchloride is treated with ammonia followed by the reaction with Chloromethane.

Appears in 1 question paper
Chapter: [7] P - Block Elements
Concept: Group 15 Elements - The Nitrogen Family >> Ammonia

The major product of acid catalysed dehydration of 1-methylcyclohexanol is ______.

Appears in 1 question paper
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Methods of Preparation of Alcohols

Given below are two statements labelled as Assertion (A) and Reason (R).

Assertion (A): An ether is more volatile than an alcohol of comparable molecular mass

Reason (R): Ethers are polar in nature.

Select the most appropriate answer from the options given below:

Appears in 1 question paper
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Physical Properties of Ethers

Name the suitable alcohol and reagent, from which 2-Chloro-2-methyl propane can be prepared.

Appears in 1 question paper
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Preparation of Ethers

Write the equations for the following reaction:

Tert butyl chloride is treated with sodium ethoxide.

Appears in 1 question paper
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Preparation of Ethers

Arrange the following in the increasing order of their property indicated:

4-Nitrobenzoic acid, benzoic acid, 3,4-Dinitrobenzoic acid, 4-Methoxy benzoic acid (Acid strength)

Appears in 1 question paper
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Chemical Reactions of Alcohols and Phenols >> Reactions Involving Cleavage of O-H Bond

Which of the following reactions are feasible?

Appears in 1 question paper
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Preparation of Ethers

Write the equation for the following:

Reaction of chlorobenzene with CH3Cl/anhyd. AlCl3.

Appears in 1 question paper
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Chemical Reaction of Ethers - Electrophilic Substitution

Which of the following observation is shown by 2-phenyl ethanol with Lucas Reagent?

Appears in 1 question paper
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Chemical Reactions of Alcohols and Phenols >> Reactions Involving Cleavage of Carbon–Oxygen (C–O) Bond in Alcohols

Anisole undergoes bromination with bromine in ethanoic acid even in the absence of iron (III) bromide catalyst.

Appears in 1 question paper
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Chemical Reaction of Ethers - Electrophilic Substitution

Write the name of the reaction, structure and IUPAC name of the product formed when:

\[\ce{CH3CH2CH(CH3)CH(CH3) ONa}\] reacts with \[\ce{C2H5Br}\]

Appears in 1 question paper
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Preparation of Ethers

Write the structure of 3-methyl butanal

Appears in 1 question paper
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Nomenclature of Aldehydes and Ketones

How will you bring about the following conversions?

Propanone to propane

Appears in 1 question paper
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Chemical Reactions of Aldehydes and Ketones - Reduction

Although phenoxide ion has more number of resonating structures than carboxylate ion, carboxylic acid is a stronger acid than phenol. Give two reasons.

Appears in 1 question paper
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Chemical Reactions of Carboxylic Acids - Reactions Involving Cleavege of O-H Bond

Complete the following reactions:

 

Appears in 1 question paper
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Chemical Reactions of Aldehydes and Ketones - Other Reactions

Write the structures of A and B in the following reactions:

Appears in 1 question paper
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Preparation of Aldehydes and Ketones

Write the structures of A and B in the following reactions

Appears in 1 question paper
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Methods of Preparation of Carboxylic Acids

Distinguish between: CH3COOH and HCOOH

Appears in 1 question paper
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: Chemical Reactions of Aldehydes and Ketones - Oxidation
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