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 Multiple Choice QuestionsMultiple Choice Questions

251.

Which one of the following compounds, is most acidic?

  • Cl-CH2-CH2-OH


252.

Alcoholic beverages contain :

  • isopropyl alcohol

  • n- propyl alcohol

  • ethyl alcohol

  • methyl alcohol


253.

In the reaction AH2SO4K2Cr2O7 acetone oxidation  acetic acid, A is

  • 1- propanol

  • 2- butanol

  • 2- propanol

  • ethanol


254.

Picric acid is :

  • 2, 4, 6-tribromophenol

  • sym-trinitrophenol

  • trinitrophenol

  • 2, 4, 6-trinitrotoluene


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255.

The cleavage of an aryl-alkyl ether with cold HI gives:

  • alkyl iodide and water

  • aryl iodide and water

  • alkyl iodide, aryl iodide and water

  • phenol and alkyl iodide


256.

In Lucas test an alcohol reacts immediately and gives insoluble chloride. The alcohol is

  • CH3OH

  • CH3CH2OH

  • (CH3)2CHOH

  • (CH3)3COH


257.

Glycerol is more viscous than ethanol due to

  • high molecular weight

  • high boiling point

  • many hydrogen bonds per molecule

  • Fajan's rule


258.

Toluene on treatment with CrOand (CH3CO)2O followed by hydrolysis with dil HCl gives

  • benzaldehyde

  • benzoic acid

  • phenol

  • phenylacetaldehyde


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259.

Diacidic base is

  • CH2(OH)2

  • Ca(OH)2

  • CH3CH(OH)2

  • All of these


B.

Ca(OH)2

Bases are the substance which give -OH ions (hydroxyl ions) when dissolved in
water. If one molecule of a base gives two hydroxyl ions, it is called diacidic base.

(i) CH2(OH)2 is a covalent compound and C-O bond is more stronger than O-H bond. Hence, it dissociates to give only a less amount of H+ ions instead of OH- ion and acts as acid. 

  

(ii) Ca(OH)2 , being an ionic compound readily gives two hydroxyl ions when dissolved in water, hence it is a diacidic base.

  Ca(OH)→ Ca2+ + 2OH-

(iii) CH3CH(OH)2 is also a covalent compound and gives a small amount of H+ ions, hence it is an acid.

 

Actually when two-OH groups are attached with same carbon atoms, the compound is highly unstable and loses a water molecule, eg,

 

 


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260.

Phenol on treatment with diethyl sulphate in presence of NaOH give

  • phenetole

  • anisole

  • diphenyl ether

  • diethyl ether


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