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

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Amides can be converted into amines by the reaction named ______.

Appears in 1 question paper
Chapter: [9] Amines
Concept: Preparation of Amines

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

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

Appears in 1 question paper
Chapter: [9] Amines
Concept: Chemical Reactions of Amines - Electrophilic Substitution

Arrange the decreasing order of pKb values.

\[\ce{C6H5NH2, C6H5NHCH3, C6H5CH2NH2, CH3NH2, NH3}\]

Appears in 1 question paper
Chapter: [9] Amines
Concept: Chemical Reactions of Amines - Basic Character of Amines

Arrange the increasing order of solubility in water.

\[\ce{C2H5Cl, C2H5NH2, C2H5OH}\]

Appears in 1 question paper
Chapter: [9] Amines
Concept: Classification of Amines

Arrange the decreasing boiling point.

\[\ce{CH3COOH, C2H5OH, CH3NH2, CH3OCH3}\]

Appears in 1 question paper
Chapter: [9] Amines
Concept: Physical Properties of Amines

Write the structural difference between starch and cellulose.

Appears in 1 question paper
Chapter: [10] Biomolecules
Concept: Classification of Carbohydrates >> Polysaccharides

Which one of the following is a polysaccharide:

Starch, Maltose, Fructose, Glucose

Appears in 1 question paper
Chapter: [10] Biomolecules
Concept: Classification of Carbohydrates >> Polysaccharides

Define the following term as related to proteins:

Denaturation

Appears in 1 question paper
Chapter: [10] Biomolecules
Concept: Denaturation of Proteins

What do you understand by the term glycosidic linkage?

Appears in 1 question paper
Chapter: [10] Biomolecules
Concept: Classification of Carbohydrates >> Disaccharides

What products would be formed when a nucleotide from DNA containing thymine is hydrolysed?

Appears in 1 question paper
Chapter: [10] Biomolecules
Concept: Chemical Composition of Nucleic Acids

Differentiate between  the following:

Fibrous proteins and Globular proteins

Appears in 1 question paper
Chapter: [10] Biomolecules
Concept: Structure of Proteins

The two strands in DNA are not identical but are complementary. Explain.

Appears in 1 question paper
Chapter: [10] Biomolecules
Concept: Structure of Nucleic Acids

Which one of the following is a monosaccharide: 

 starch, maltose, fructose, cellulose

Appears in 1 question paper
Chapter: [10] Biomolecules
Concept: Classification of Carbohydrates >> Monosaccahrides

What is the difference between acidic amino acids and basic amino acids?

Appears in 1 question paper
Chapter: [10] Biomolecules
Concept: Biomolecules in the Cell > Proteins >> Amino Acids

Glucose on reaction with HI gives n-hexane. What does it suggest about the structure of glucose?

 

 
Appears in 1 question paper
Chapter: [10] Biomolecules
Concept: Structures of Glucose

Which component of starch is a branched polymer of α-glucose and insoluble in water?

Appears in 1 question paper
Chapter: [10] Biomolecules
Concept: Preparation of Glucose

Deficiency of which vitamin causes scurvy?

Appears in 1 question paper
Chapter: [10] Biomolecules
Concept: Classification of Vitamins

What type of linkage is responsible for the formation of proteins?

Appears in 1 question paper
Chapter: [10] Biomolecules
Concept: Chemical Composition of Nucleic Acids

Write the product formed when glucose is treated with HI ?

Appears in 1 question paper
Chapter: [10] Biomolecules
Concept: Chemical Composition of Nucleic Acids

 Write one example of a Natural polymer.

Appears in 1 question paper
Chapter: [10] Biomolecules
Concept: Denaturation of Proteins
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