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

Write the equation of the following reaction:

Friedel-Crafts reaction - alkylation of anisole

Write the equation of the following reaction:

Nitration of anisole.

Write the equation of the following reaction:

Bromination of anisole in an ethanoic acid medium.

Write the equation of the following reaction:

Friedel-Craft’s acetylation of anisole.

Why does O₃ act as a powerful oxidising agent?

How is O₃ estimated quantitatively?

Which aerosols deplete ozone?

What happens when CdCl₂ is doped with AgCl?

Calculate the freezing point of a solution containing 60 g of glucose (Molar mass = 180 g mol^–1) in 250 g of water. (K_f of water = 1.86 K kg mol^–1)

Give reasons for the following:

Measurement of osmotic pressure method is preferred for the determination of molar masses of macromolecules such as proteins and polymers.

(A), (B) and (C) are three non-cyclic functional isomers of a carbonyl compound with molecular formula C₄H₈O. Isomers (A) and (C) give positive Tollens' test whereas isomer (B) does not give Tollens' test but gives positive Iodoform test. Isomers (A) and (B) on reduction with Zn(Hg)/conc. HCl give the same product (D).

1) Write the structures of (A), (B), (C) and (D).

2) Out of (A), (B), and (C) isomers, which one is least reactive towards the addition of HCN?

Write one difference between α-helix and β-pleated structures of proteins.

Write two advantages of fuel cell

The two O−O bond lengths in the ozone molecule are equal.

 What happens when AgCl is doped with 2? CdCl What is the name of this defect? 

What happens when Anisole is treated with CH₃Cl/anhydrous  AlCl₃?

A 4% solution(w/w) of sucrose (M = 342 g mol^–1) in water has a freezing point of 271.15 K. Calculate the freezing point of 5% glucose (M = 180 g mol^–1) in water.
(Given: Freezing point of pure water = 273.15 K) 

Differentiate between the following :

Peptide linkage and Glycosidic linkage 

Why phenol undergoes electrophilic substitution more easily than benzene? 

Give a reason for the following :
Ozone is thermodynamically less stable than oxygen.