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

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

1-Propoxypropane

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?

Draw labelled diagram Dialysis.

Name an important alloy which contains some of the lanthanoid metals.

Name an important alloy which contains some of the lanthanoid metals. Mention its uses.

8 g of glucose, C₆H₁₂O₆ (Molar Mass = 180 g mol⁻¹) is dissolved in 1 kg of water in a sauce pan. At what temperature will this solution boil? 

(K_b for water = 0.52 K kg mol⁻¹, boiling point of pure water = 373.15 K)

Calculate the boiling point of solution when 4g of MgSO₄ (M= 120 g mol^-1) was dissolved in 100g of water, assuming MgSO4 undergoes complete ionization. (K_b for water = 0.52 K kgmol^-1)

Write the structures of A and B in the following reactions

Predict the products of the following reactions:

Illustrate the following reaction giving suitable example in each case: Diazotisation