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:

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 the following conversion can be carried out?

Benzene to 4-bromonitrobenzene

Complete the following reactions: C₂H₄ + O₂ →

Complete the following reactions:  4Al + 3O₂ →

Why is dioxygen a gas but sulphur a solid?

Why do noble gases have comparatively large atomic sizes?

What type of point defect is produced when AgCl is doped with CdCl₂?

Complete the following reactions:

Write the major products(s) in the following:

Define electrochemical cell

Why does the cell potential of mercury cell remain constant throughout its life?

On the basis of crystal field theory, write the electronic configuration for d⁴ ion if Δ₀ > P.

From the given cells:

Lead storage cell, Mercury cell, Fuel cell and Dry cell

Answer the following:

(i) Which cell is used in hearing aids?

(ii) Which cell was used in Apollo Space Programme?

(iii) Which cell is used in automobiles and inverters?

(iv) Which cell does not have long life?

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