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

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complete the following reaction:

\[\ce{(C6H5CH2)2Cd + 2CH3COCl}\]

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

Answer the following question.
Write one stereochemical difference between SN1 and SN2 reactions.

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

How will you convert the following:
Zinc blende to Zinc metal

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Application of Thermodynamic Principles of Metallurgy

How will you convert the following:
[Ag(CN)2] to Ag

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

Write the structure of main compounds A and B in the following reaction:
 

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

Allyl chloride is hydrolysed more readily than n-propyl chloride. Why?

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

Convert the following:

Chloroethane to methanamine.

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Polyhalogen Compounds

Which one of the following compounds is more reactive towards SN1 reaction?

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

Give reason for the following:

During the electrophilic substitution reaction of haloarenes, para-substituted derivative is the major product.

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

Give reason for the following:

The product formed during SN1 reaction is a racemic mixture.

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

Out of the Chloromethane and Fluoromethane, which one is has higher dipole moment and why?

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Nature of C-X Bond of Haloalkanes and Haloarenes

Identify the major product formed when 2-cyclohexylchloroethane undergoes a dehydrohalogenation reaction. Name the reagent which is used to carry out the reaction.

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

Why are haloalkanes more reactive towards nucleophilic substitution reactions than haloarenes and vinylic halides?

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

Give reasons for the following statement:

Copper does not displace hydrogen from acids.

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

In which reaction mechanism carbocation is formed?

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

The conversion of an alkyl halide into an alkene by alcoholic KOH is classified as ______.

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

Racemisation occurs in ______.

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

Assertion (A) : Nucleophilic substitution of iodoethane is easier than chloroethane.

Reason (R) : Bond enthalpy of C-I bond is less than that of C-Cl bond.

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

Which of the following belongs to the class of vinyl halides?

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

Retention of configuration is observed in ______.

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