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 Multiple Choice QuestionsMultiple Choice Questions

41.

Reaction of ethyl formate with excess of CH3MgI followed by hydrolysis gives

  • n-propyl alcohol

  • isopropyl alcohol

  • acetaldehyde

  • acetone


42.

Which among the following alcohols is most reactive with sodium wire?

  • Ethanol

  • 2-Propanol

  • 2-Butanol

  • 2-Methyl-2-butanol


43.

In Williamson's synthesis, ethoxyethane is prepared by :

  • passing ethanol over heated alumina

  • heating sodium ethoxide with ethyl bromide

  • treating ethyl alcohol with excess of H2SO4 at 430-440 K

  • heating ethanol with dry Ag2O


44.

The correct order of reactivity of phenyl Magnesium bromide with the following compound is:

  • (II)> (III)> (I)

  • (I)> (III)> (II)

  • (II)> (I)> (III)

  • (I)> (II)> (III)


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45.

reacts with acetic acid in presence of Hg2+ to give:

  • None of these


46.

Phenol and benzoic acid are distinguished by

  • NaOH

  • NaHCO3

  • Na2CO3

  • H2SO4


47.

Phenol reacts with chloroform in presence of

  • H2SO4

  • KOH

  • NaNO2/ HCl

  • G.R.


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48.

The alcohol that produces turbidity immediately with ZnCL2 + conc. HCl at room temperature:

  • 1- hydroxybutane

  • 2- hydroxybutane

  • 2- hydroxy -2- methyl propane

  • 1- hydroxy -2- methyl propane


C.

2- hydroxy -2- methyl propane

(CH3)3CH-OH + HCl Anhydrous ZnCl2+HCl(CH3)3C-Cl +H2O;

3o reacts immediately.

(CH3)3CH-Cl + HClAnhydrous ZnCl2+HCl

(CH3)2CH-Cl + H2O, 2o reacts after 5 min

CH3CH2CH2-OH + HCl Anhydrous ZnCl2+HCl

CH3CH2CH2-Cl + H2O ; 1o reacts only on heating


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49.

The compound which reacts faster with Lucas reagent is

  • butan-1-ol

  • butan-2-ol

  • 2-methyl-propan-1-ol

  • 2-methyl propan-2-ol


50.

In the given reaction ,

R-OH + HX RX + H2O

the order of reactivity of alcohols is:

  • tertiary < secondary < primary

  • tertiary > secondary > primary

  • tertiary < secondary > primary

  • secondary > primary > tertiary


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