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Science (English Medium) Class 12 - CBSE Important Questions for Chemistry

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How do you convert the following : Propan-2-ol to 2-methylpropan-2-ol

Appears in 3 question papers
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Methods of Preparation of Alcohols

Write the mechanism of the following reaction :

Appears in 3 question papers
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Chemical Reactions of Alcohols and Phenols >> Reactions Involving Cleavage of Carbon–Oxygen (C–O) Bond in Alcohols

Write the equation involved in the acetylation of Salicylic acid.

Appears in 3 question papers
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Chemical Reactions of Alcohols and Phenols >> Reactions Involving Cleavage of O-H Bond

Account for the following :

Acidic character increases from HF to HI.

Appears in 3 question papers
Chapter: [7] P - Block Elements
Concept: Concept of Group 17 Elements

Account for the following : There is large difference between the melting and boiling points of oxygen and sulphur.

Appears in 3 question papers
Chapter: [7] P - Block Elements
Concept: Concept of Group 16 Elements

Draw the structures of the following : ClF3

Appears in 3 question papers
Chapter: [7] P - Block Elements
Concept: P - Block Group 17 Elements >> Interhalogen Compounds

Which allotrope of phosphorus is more reactive and why?

Appears in 3 question papers
Chapter: [7] P - Block Elements
Concept: p-Block elements of Group 15 Elements >> Phosphorus - Allotropic Forms

How the supersonic jet aeroplanes are responsible for the depletion of ozone layers?

Appears in 3 question papers
Chapter: [7] P - Block Elements
Concept: P - Block Group 16 Elements >> Ozone

F2 has lower bond dissociation enthalpy than Cl2. Why?

Appears in 3 question papers
Chapter: [7] P - Block Elements
Concept: Concept of Group 17 Elements

Which noble gas is used in filling balloons for meteorological observations?

Appears in 3 question papers
Chapter: [7] P - Block Elements
Concept: P - Block Group 18 Elements >> Concept of Group 18 Elements

Complete the equation :​ XeF2+PF5 

Appears in 3 question papers
Chapter: [7] P - Block Elements
Concept: P - Block Group 18 Elements >> Concept of Group 18 Elements

Give reasons for the following : (CH3)3 P = O exists but (CH3)3 N = O does not.

Appears in 3 question papers
Chapter: [7] P - Block Elements
Concept: Concept of Group 15 Elements

Give reasons for the following : Oxygen has less electron gain enthalpy with negative sign than sulphur.

Appears in 3 question papers
Chapter: [7] P - Block Elements
Concept: Concept of Group 16 Elements

Give reasons for the following : H3PO2 is a stronger reducing agent than H3PO3.

 

Appears in 3 question papers
Chapter: [7] P - Block Elements
Concept: p-Block elements of Group 15 Elements >> Oxoacids of Phosphorus

Which halogen compound in the following pair will react faster in SN2 reaction CH3Br or CH3I.

Appears in 3 question papers
Chapter: [7] P - Block Elements
Concept: Concept of Group 17 Elements

Which halogen compound in each of the following pairs will react faster in SN2 reaction

(CH3)3 C – Cl or CH3 – Cl

Appears in 3 question papers
Chapter: [7] P - Block Elements
Concept: Concept of Group 17 Elements

Draw the structure of the following:

H2SO4

Appears in 3 question papers
Chapter: [7] P - Block Elements
Concept: P - Block Group 16 Elements >> Sulphuric Acid

What is meant by hydroboration-oxidation reaction? Illustrate it with an example.

Appears in 3 question papers
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Methods of Preparation of Alcohols

Give reasons Thermal stability decreases from H2O to H2Te.

Appears in 3 question papers
Chapter: [7] P - Block Elements
Concept: Concept of Group 16 Elements

Write the product(s) in the following reactions

Appears in 3 question papers
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Physical Properties of Ethers
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