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

How can the activating effect of the −NH₂ group in aniline be controlled?

Why is the α-hydrogens of aldehydes and ketones are acidic in nature?

Assertion (A): Bromination of benzoic acid, gives m-bromobenzoic acid.

Reason (R): Carboxyl group increases the electron density at the meta position.

Explain [Fe(CN)₆]³⁻ is an inner orbital complex, whereas [FeF₆]³⁻ is an outer orbital complex.

[Atomic number: Fe = 26]

Assertion (A): The final product in Aldol condensation is always α, β-unsaturated carbonyl compound.

Reason (R): α, β-unsaturated carbonyl compounds are stabilised due to conjugation.

Identify A and B:

Explain why the electrophilic substitution reactions in haloarenes occur slowly and require more drastic conditions as compared to those in benzene.

Write the name of the reaction, structure and IUPAC name of the product formed when:

\[\ce{CH3CH2CH(CH3)CH(CH3) ONa}\] reacts with \[\ce{C2H5Br}\]

Write the name of reagent and equation for the preparation of the following ether by Williamson’s synthesis:

2-Methoxy-2-methylpropane

Write the name of reagent and equation for the preparation of the following ethers by Williamson’s synthesis:

2-Methoxy-2-methylpropane

Describe a method for refining nickel.

Write the name of reagent and equation for the preparation of the following ethers by Williamson’s synthesis:

2-Methoxy-2-methylpropane

Describe a method for refining nickel.

Write the name of the reagent and equation for the preparation of the following ether by Williamson’s synthesis:
2-Methoxy-2-methylpropane

Describe a method for refining nickel.

Write the name of reagents and equations for the preparation of the following ethers by Williamson’s synthesis:

2-Methoxy-2-methylpropane

Describe a method for refining nickel.

Write the name of reagent and equation for the preparation of the following ethers by Williamson’s synthesis:

2-Methoxy-2-methylpropane

Describe a method for refining nickel.