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Karnataka Board PUCPUC Science 2nd PUC Class 12

PUC Science 2nd PUC Class 12 - Karnataka Board PUC Question Bank Solutions

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How are the colloidal solutions classified on the basis of physical states of the dispersed phase and dispersion medium?

[5] Surface Chemistry
Chapter: [5] Surface Chemistry
Concept: undefined >> undefined

Why are hydrophobic sols easily coagulated?

[5] Surface Chemistry
Chapter: [5] Surface Chemistry
Concept: undefined >> undefined

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How are colloids classified on the basis of Physical states of components

[5] Surface Chemistry
Chapter: [5] Surface Chemistry
Concept: undefined >> undefined

How are colloids classified on the basis of the nature of the dispersion medium?

[5] Surface Chemistry
Chapter: [5] Surface Chemistry
Concept: undefined >> undefined

How are colloids classified on the basis of interaction between the dispersed phase and the dispersion medium?

[5] Surface Chemistry
Chapter: [5] Surface Chemistry
Concept: undefined >> undefined

Account for the following:

Diazonium salts of aromatic amines are more stable than those of aliphatic amines.

[9] Amines
Chapter: [9] Amines
Concept: undefined >> undefined

Show how the following compound can be converted to benzoic acid.

Ethylbenzene

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

Show how the following compound can be converted to benzoic acid.

Acetophenone

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

Show how the following compound can be converted to benzoic acid.

Bromobenzene

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

Show how the following compound can be converted to benzoic acid.

Phenylethene (Styrene)

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

Predict the products formed when cyclohexanecarbaldehyde reacts with the following reagent.

Tollens’ reagent

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

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.

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

How will you prepare the given compound from benzene? You may use any inorganic reagent and any organic reagent having not more than one carbon atom.

Methyl benzoate

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

How will you prepare the given compound from benzene? You may use any inorganic reagent and any organic reagent having not more than one carbon atom.

m-Nitrobenzoic acid

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

How will you prepare the given compound from benzene? You may use any inorganic reagent and any organic reagent having not more than one carbon atom.

p-Nitrobenzoic acid

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

How will you prepare the given compound from benzene? You may use any inorganic reagent and any organic reagent having not more than one carbon atom.

Phenylacetic acid

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

How will you bring about the following conversion in not more than two steps?

Benazaldehyde to α-Hydroxyphenylacetic acid

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

Complete the synthesis by giving missing starting material, reagent or product.

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

Comment on the nature of two S−O bonds formed in SO2 molecule. Are the two S−O bonds in this molecule equal?

[7] P - Block Elements
Chapter: [7] P - Block Elements
Concept: undefined >> undefined

How is the presence of SO2 detected?

[7] P - Block Elements
Chapter: [7] P - Block Elements
Concept: undefined >> undefined
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