Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions

How are colloids classified on the basis of interaction between the dispersed phase and the dispersion medium?

Discuss the nature of bonding in metal carbonyls.

Where does the water present in the egg go after boiling the egg?

What is the effect of denaturation on the structure of proteins?

Account for the following:

Diazonium salts of aromatic amines are more stable than those of aliphatic amines.

Predict the product of the following reaction:

\[\ce{CH3 - CH2 - CH2 - O - CH3 + HBr ->}\]

Predict the product of the following reaction:

Predict the product of the following reaction:

\[\ce{(CH3)3C - OC2H5 ->[HI]}\]

Show how will you synthesize cyclohexylmethanol using an alkyl halide by an S_N2 reaction.

Write the equation of the reaction of hydrogen iodide with 1-propoxypropane.

Write the equation of the reaction of hydrogen iodide with methoxybenzene.

Write the equation of the reaction of hydrogen iodide with benzyl ethyl ether.

Explain the fact that in aryl alkyl ethers 

1. the alkoxy group activates the benzene ring towards electrophilic substitution and
2. it directs the incoming substituents to ortho and para positions in the benzene ring.

Write the mechanism of the reaction of HI with methoxymethane.

Why does O₃ act as a powerful oxidising agent?

How is O₃ estimated quantitatively?

Which aerosols deplete ozone?

Write the product(s) in the following reaction

Write the formula of reagents used in the following reactions :

Bromination of phenol to 2,4,6-tribromophenol

Write the formula of reagents used in the following reactions :

Hydroboration of propene and then oxidation to propanol.