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

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

2-Methoxy-2-methylpropane 

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

2-Methoxy-2-methylpropane

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.

Draw the structure of the following compound.

3-Bromo-4-phenylpentanoic acid

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

2-Methoxy-2-methylpropane

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

On adding NaOH to ammonium sulphate, a colourless gas with pungent odour is evolved, which forms a blue-coloured complex with Cu²⁺ ion. Identify the gas.

Out of 1 M glucose and 2 M glucose, which one has a higher boiling point and why?

Name the reagents used in the following reactions:

Why is elevation of boiling point a colligative property?

Define the following term: 

Molal elevation constant (K_b)

Based on molecular forces, what type of polymer is neoprene?

Explain the following term with suitable examples: 

Frenkel defect

Explain the following term with a suitable example:

Interstitials

Boiling point of water at 750 mm Hg is 99.63°C. How much sucrose is to be added to 500 g of water such that it boils at 100°C? Molal elevation constant for water is 0.52 K kg mol⁻¹.