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 Multiple Choice QuestionsMultiple Choice Questions

1.

The reaction of propene with HOCl(Cl2+H2O) proceeds through the intermediate:

  • CH3−CH+−CH2−Cl

  • CH3−CH(OH)−C+H2

  • CH3−CHCl−C+H2

  • CH3−CHCl−C+H2

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2.

The product of the reaction given below is:

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3.

The synthesis of alkyl fluorides is best accomplished by

  • free radical fluorination

  • Sandmeyer's reaction

  • Finkelstein reaction

  • Finkelstein reaction


D.

Finkelstein reaction

Alkyl fluorides can be prepared by the action of mercurous fluorides or antimony trifluoride (inoragnic fluorides) on corresponding alkyl halide.

This reaction is known as Swarts reaction

CH3Br + AgF → CH3F + AgBr
But, when the action of NaI/acetone takes place on alkyl chloride or bromide alkyl iodide forms. This reaction is called 'Finkelstein reaction.

Free radical fluoridation is a highly explosive reaction. So not preferred for the preparation of fluoride.

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4.

In SN2 reactions, the correct order of reactivity for the following compounds CH3Cl, CH3CH2Cl, (CH3)2CHCl and (CH3)3CCl is

  • CH3Cl > (CH3)2CHCl >CH3CH2Cl > (CH3)3CCl

  • CH3Cl > CH3CH2Cl > (CH3)2CHCl >(CH3)3CCl

  • CH3CH2Cl > CH3Cl >(CH3)2CHCl >(CH3)3CCl

  • CH3CH2Cl > CH3Cl >(CH3)2CHCl >(CH3)3CCl

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5.

The major organic compound formed by the reaction of 1,1,1-trichloroethane with silver powder is

  • acetylene

  • ethene

  • 2-butyne

  • 2-butyne

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6.

The order of stability of the following carbocations,

  • III>II>I

  • II> III>I

  • I>II>III

  • I>II>III

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7.

An unknown alcohol is treated with the “Lucas reagent” to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism

  • Secondary alcohol by SN1

  • Tertiary alcohol by SN1

  • Secondary alcohol by SN2

  • Secondary alcohol by SN2

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8.

What is DDT among the following

  • Greenhouse gas 

  • A fertilizer

  • Biodegradable pollutant

  • Biodegradable pollutant

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9.

2–Hexyne gives trans–2–Hexene on treatment with

  • Pt/H2

  • Li/NH3

  • Pd/BaSO4

  • Pd/BaSO4

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10.

In the given transformation, which of the following is the most appropriate reagent?

  • NH2NH2,O-H

  • Zn − Hg/HCl

  • Na,Liq.NH3

  • Na,Liq.NH3

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