Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

Draw the structure of the following compound.

3-Bromo-4-phenylpentanoic acid

Define van’t Hoff factor.

What happens when: SO₂ gas is passed through an aqueous solution Fe⁺³ salt?

Write the structures of A and B in the following reactions

Predict the products of the following reactions:

Name the reagents used in the following reactions:

3.9 g of benzoic acid dissolved in 49 g of benzene shows a depression in freezing point of 1.62 K. Calculate the van't Hoff factor and predict the nature of solute (associated or dissociated).

(Given : Molar mass of benzoic acid = 122 g mol⁻¹, K_f for benzene = 4.9 K kg mol⁻¹)

Calculate the amount of benzoic acid (C₆H₅COOH) required for preparing 250 mL of 0.15 M solution in methanol.

19.5 g of CH₂FCOOH is dissolved in 500 g of water. The depression in the freezing point of water observed is 1.0°C. Calculate the van’t Hoff factor and dissociation constant of fluoroacetic acid.

What are enzymes?

Account for the following:

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

Show how the following compound can be converted to benzoic acid.

Ethylbenzene

Show how the following compound can be converted to benzoic acid.

Acetophenone

Show how the following compound can be converted to benzoic acid.

Bromobenzene

Show how the following compound can be converted to benzoic acid.

Phenylethene (Styrene)

Predict the products formed when cyclohexanecarbaldehyde reacts with the following reagent.

Tollens’ reagent

An organic compound (A) (molecular formula C₈H₁₆O₂) was hydrolysed with dilute sulphuric acid to give a carboxylic acid (B) and an alcohol (C). Oxidation of (C) with chromic acid produced (B). (C) on dehydration gives but-1-ene. Write equations for the reactions involved.

How will you prepare the given compound from benzene? You may use any inorganic reagent and any organic reagent having not more than one carbon atom.

Methyl benzoate

How will you prepare the given compound from benzene? You may use any inorganic reagent and any organic reagent having not more than one carbon atom.

m-Nitrobenzoic acid

How will you prepare the given compound from benzene? You may use any inorganic reagent and any organic reagent having not more than one carbon atom.

p-Nitrobenzoic acid