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HSC Science (Electronics) 12th Standard Board Exam - Maharashtra State Board Important Questions

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Complete and rewrite the balanced chemical equations

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Chapter: [10] Halogen Derivatives
Concept: Nomenclature of Haloalkanes and Haloarenes

Give balanced equations for the following reactions:

Acetic anhydride with phosphorus pentachloride.

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Chapter: [10] Halogen Derivatives
Concept: Polyhalogen Compounds

What are racemates?

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Chapter: [10] Halogen Derivatives
Concept: Reactions of Haloalkanes - Elimination Reactions

Give reason:

Reactions involving Grignard reagent must be carried out under anhydrous condition.

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Chapter: [10] Halogen Derivatives
Concept: Reaction with Active Metals

Give reason:

Alkyl halides are generally not prepared by free radical halogenation of alkanes.

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Chapter: [10] Halogen Derivatives
Concept: Methods of Preparation of Alkyl Halides

Complete the following reaction sequence by writing the structural formulae of the organic compound 'A', 'B' and 'C'.

\[\ce{2-Bromobutane->[Alc.KOH]A->[][Br2]B->[][NaNH2]C}\]

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Chapter: [10] Halogen Derivatives
Concept: Chemical Properties of Halogen Derivatives

The following will react faster by SN1 mechanism

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Chapter: [10] Halogen Derivatives
Concept: Chemical Properties of Halogen Derivatives

Name the reagent used to convert alkyl halide to ester.

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Chapter: [10] Halogen Derivatives
Concept: Methods of Preparation of Alkyl Halides

Explain. Aryl halides are less reactive than alkyl halides towards nucleophilic substitution reactions.

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Chapter: [10] Halogen Derivatives
Concept: Chemical Properties of Halogen Derivatives

What is dehydrohalogenation? State the rule for the formation of the preferred product of dehydrohalogenation.

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Chapter: [10] Halogen Derivatives
Concept: Chemical Properties of Halogen Derivatives

Observe the following compounds and answer the questions given below.


      (I)

\[\ce{\underset{\text{(II)}}{CH3 - CH2 - Br}}\]

  1. Identify the type of halides.
  2. Explain the nature of the C – Br bond in both of these halides.
  3. Which of these compounds will undergo aqueous alkaline hydrolysis readily? Write the reaction in support of your answer.
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Chapter: [10] Halogen Derivatives
Concept: Reactions of Haloalkanes - Elimination Reactions

Write the product formed when alkyl halide reacts with silver nitrite.

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Chapter: [10] Halogen Derivatives
Concept: Chemical Properties of Halogen Derivatives

What is the action of following on ethyl bromide:

Na in dry ether

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Chapter: [10] Halogen Derivatives
Concept: Reaction with Active Metals

Write chemical reactions for the following conversions:

Bromobenzene to toluene.

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Chapter: [10] Halogen Derivatives
Concept: Reaction with Active Metals

Write IUPAC names of following compounds.

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Chapter: [10] Halogen Derivatives
Concept: Nomenclature of Halogen Derivatives

Write IUPAC names of following compounds.

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Chapter: [10] Halogen Derivatives
Concept: Nomenclature of Halogen Derivatives

The allylic halide, among the following, is ______.

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Chapter: [10] Halogen Derivatives
Concept: Classification of Halogen Derivatives

Write the chemical reaction for the following:

Chlorobenzene is heated with fuming H2SO4.

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Chapter: [10] Halogen Derivatives
Concept: Reaction with Active Metals

Write the structure of the product formed when chlorobenzene is treated with sodium metal in the presence of dry ether.

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Chapter: [10] Halogen Derivatives
Concept: Reaction with Active Metals

Explain the dehydrohalogenation reaction of 2-chlorobutane.

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Chapter: [10] Halogen Derivatives
Concept: Chemical Properties of Halogen Derivatives
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