Organic Chemistry - Some Basic Principles and Techniques Quiz - CBSE Class 11 Science
Free practice quiz: Organic Chemistry - Some Basic Principles and Techniques (CBSE Class 11 Science). 17 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which of the following is NOT a characteristic of organic compounds?
- Generally contain carbon
- Usually flammable
- High melting and boiling points
- Covalent bonding
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Answer: C. High melting and boiling points
Organic compounds typically have lower melting and boiling points compared to inorganic compounds due to weaker intermolecular forces.
Which technique is used to purify solids by repeated crystallization?
- Distillation
- Sublimation
- Recrystallization
- Chromatography
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Answer: C. Recrystallization
Recrystallization involves dissolving the solid in a hot solvent, then cooling it to allow pure crystals to form.
What is the role of a dehydrating agent in organic reactions?
- To add water
- To remove water
- To add hydrogen
- To remove hydrogen
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Answer: B. To remove water
Dehydrating agents, such as concentrated sulfuric acid, remove water molecules from reactants.
Explain the concept of electromeric effect.
- Shift of electrons in a covalent bond due to the presence of an electronegative atom
- Delocalization of electrons in a conjugated system
- Temporary shift of a shared electron pair under the influence of a reagent
- Permanent polarization of a covalent bond
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Answer: C. Temporary shift of a shared electron pair under the influence of a reagent
The electromeric effect is a temporary displacement of electrons in a multiple bond caused by the approach of an attacking reagent.
Discuss the factors affecting the rate of SN1 and SN2 reactions.
- Substrate structure, leaving group, nucleophile, solvent
- Only substrate structure and leaving group
- Only nucleophile and solvent
- Only substrate structure
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Answer: A. Substrate structure, leaving group, nucleophile, solvent
The rate of SN1 and SN2 reactions are influenced by various factors such as substrate structure, the nature of the leaving group, the nucleophile, and the solvent.