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

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Write the structure of the major organic product in the following reaction:

\[\ce{CH3CH2CH2Cl + NaI ->[acetone][heat]}\]

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Methods of Preparation of Haloalkanes

Write the structure of the major organic product in the following reaction:

\[\ce{C6H5ONa + C2H5Cl ->}\]

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Reactions of Haloalkanes - Reaction with Metals

What happens when ethyl chloride is treated with aqueous KOH?

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Reactions of Haloalkanes - Nucleophilic Substitution Reactions

How the following conversion can be carried out?

Ethyl chloride to propanoic acid.

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Reactions of Haloalkanes - Nucleophilic Substitution Reactions

C–Cl bond length in chlorobenzene is shorter than C–Cl bond length in CH3–Cl.

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Reactions of Haloalkanes - Nucleophilic Substitution Reactions

SN1 reactions are accompanied by racemization in optically active alkyl halides.

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Reactions of Haloalkanes - Nucleophilic Substitution Reactions

Complete the given chemical equations 

`F_2 + 2Cl^(-)`

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Oxidation Reduction

What happens when HCl is added to MnO2? Write the equations involved

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Oxidation Reduction

Write the structure of 1-Bromo-4-chlorobut-2-ene

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Nomenclature of Haloalkanes and Haloarenes

Out of  which is an example of a benzylic halide?

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Nomenclature of Haloalkanes and Haloarenes

Write the mechanism (using curved arrow notation) of the following reaction:

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Nomenclature of Haloalkanes and Haloarenes

Why does copper obtained in the extraction from copper pyrites have a blistered appearance?

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Occurrence of Metals

What is the role of depressants in the froth floatation process?

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Types of Separation or Concentration of an Ore >> Froth Floatation Method

Write the product(s) in the following reactions:

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Nomenclature of Haloalkanes and Haloarenes

Write the product(s) in the following reaction:

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Nomenclature of Haloalkanes and Haloarenes

Write the product(s) in the following reactions: 

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Nomenclature of Haloalkanes and Haloarenes

Which would undergo SN2 reaction faster in the following pair and why ?

CH3 – CH2 ​– Br and CH3 ​– CH2 ​– I

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Reactions of Haloalkanes - Nucleophilic Substitution Reactions

Indicate the principle behind the method used for the refining of Nickel.

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Refining of Crude Metals

What is the role of dilute NaCN in the extraction of gold ?

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Types of Separation or Concentration of an Ore >> Leaching

What is 'copper matte' ?

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Occurrence of Metals
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