Science (English Medium) Class 12 - CBSE Question Bank Solutions

Write the name of the reagent and the equation for the preparation of the following ether by Williamson’s synthesis:

Ethoxybenzene

Write the name of the reagent and the equation for the preparation of the following ether by Williamson’s synthesis:

2-Methoxy-2-methylpropane

Write the name of the reagent and equation for the preparation of the following ethers by Williamson’s synthesis:

1-Methoxyethane

Illustrate with examples the limitations of Williamson synthesis for the preparation of certain types of ethers.

How is 1-propoxypropane synthesised from propan-1-ol? Write mechanism of this reaction.

Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method. Give reason.

Explain the following with an example.

Williamson ether synthesis

How will you bring about the following conversion?

Benzene to biphenyl

How the following conversion can be carried out?

Benzene to diphenyl

Explain effects of lanthanoid contraction.

What are the consequences of lanthanoid contraction?

Write the structure of 3-Bromo-2-methylprop-1-ene

Write the formula of the compound of iodine which is obtained when conc. HNO₃ oxidises I₂

Write one difference in Multimolecular colloid and Associated colloid

Give reasons for the following: N₂O₅ is more acidic than N₂O₃

Account for the following: 

Zn, Cd and Hg are soft metals.

Account for the following:

Aromatic carboxylic acids do not undergo Friedel-Crafts reaction.

 How would you account the following :

 Transition metals and their compounds show catalytic properties.

How do you prepare:

K₂MnO₄ from MnO₂?

Define the following with a suitable example, of each: 
Multimolecular colloid