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

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Chemistry
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Which of the following molecules has a chiral centre correctly labelled with an asterisk (*)?

[5] Coordination Compounds
Chapter: [5] Coordination Compounds
Concept: undefined >> undefined

Assertion (A): Trans [CrCl2(ox)2]3− shows optical isomerism.

Reason (R): Optical isomerism is common in octahedral complexes involving didentate ligands.

[5] Coordination Compounds
Chapter: [5] Coordination Compounds
Concept: undefined >> undefined

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Give the reaction of glucose with hydrogen cyanide. Presence of which group is confirmed by this reaction?

[10] Biomolecules
Chapter: [10] Biomolecules
Concept: undefined >> undefined

Give a reason for the following observations:

Penta-acetate of glucose does not react with hydroxylamine.

[10] Biomolecules
Chapter: [10] Biomolecules
Concept: undefined >> undefined

In which of the following solvents, the \[\ce{C4H8NH3+X–}\] is soluble?

[1] Solutions
Chapter: [1] Solutions
Concept: undefined >> undefined

Radioactive decay follows first-order kinetics. The initial amount of two radioactive elements X and Y is 1 gm each. What will be the ratio of X and Y after two days if their half-lives are 12 hours and 16 hours respectively?

[3] Chemical Kinetics
Chapter: [3] Chemical Kinetics
Concept: undefined >> undefined

Out of p-tolualdehyde and p-nitrobenzaldehyde, which one is more reactive towards nucleophilic addition reactions, why?

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

Write the structure of the product formed when acetone reacts with 2, 4 DNP reagent.

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

Arrange the decreasing boiling point.

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

[9] Amines
Chapter: [9] Amines
Concept: undefined >> undefined

Draw structures of the given derivatives.

The ethylene ketal of hexan-3-one

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

Draw structures of the given derivatives.

The ethylene ketal of hexan-3-one

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

Draw the structure of the following derivative.

The ethylene ketal of hexane-3-one

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

Indicate the types of isomerism exhibited by the following complexes and draw the structures for these isomers: 

[Pt(NH3)(H2O)Cl2 ]

[5] Coordination Compounds
Chapter: [5] Coordination Compounds
Concept: undefined >> undefined

Draw structure of the following derivative.

The ethylene ketal of hexane-3-one

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

Draw structure of the following derivative.

Acetaldehydedimethylacetal

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

Draw structure of the following derivative.

The ethylene ketal of hexan-3-one

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

Draw structures of the following derivative.

The ethylene ketal of hexan-3-one

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined

Indicate the types of isomerism exhibited by the following complexes and draw the structure for isomers:

\[\ce{[Pt(NH3)(H2O)Cl2]}\]

[5] Coordination Compounds
Chapter: [5] Coordination Compounds
Concept: undefined >> undefined

Indicate the types of isomerism exhibited by the following complexes and draw the structures for these isomers: [Pt(NH3)(H2O)Cl2]

[5] Coordination Compounds
Chapter: [5] Coordination Compounds
Concept: undefined >> undefined

Draw the structure of the following derivative.

Acetaldehydedimethylacetal

[8] Aldehydes, Ketones and Carboxylic Acids
Chapter: [8] Aldehydes, Ketones and Carboxylic Acids
Concept: undefined >> undefined
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