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 Multiple Choice QuestionsMultiple Choice Questions

221.

The compound which gives turbidity immediately with Lucas reagent at room temperature is

  • butan-1-ol

  • butan-2-ol

  • 2-methyl propan-2-ol

  • 2-methyl propan-1-ol


222.

The conversion of m-nitrophenol to resorcinol involves respectively

  • hydrolysis, diazotization and reduction 

  • diazotization, reduction and hydrolysis

  • hydrolysis, reduction and diazotization

  • reduction, diazotization and hydrolysis


223.

HCHO was treated with a reagent X. The product formed upon hydrolysis in the presence of an acid gave C2H5OH. The reagent X is

  • alcoholic KOH

  • alcoholic KCN

  • CH3MgI

  • aqueous KOH


224.

Which one of the following is not formed when a mixture of methyl bromide and bromobenzene is heated with sodium metal in the presence of dry ether?

  • diphenyl

  • propane

  • toulene

  • ethane


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225.

Power alcohol is a mixture of

  • 80% petrol + 20% ethanol + small quantity of benzene

  • 80% ethanol + 20% benzene + small quantity of petrol

  • 50% Petrol + 50% ethanol + small quantity of benzene

  • 80% petrol + 20% benzene + small quantity of ethanol


226.

Identify 'C' in the following

  • ethanol

  • propanone

  • cumene hydroperoxide

  • water


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227.

Which of the following is strongly acidic?

  • Phenol

  • o-cresol

  • p-nitrophenol

  • p-cresol


C.

p-nitrophenol

The acidity of phenols ts due to the greater resonance stabilization of the phenoxide ion relative to phenol. Therefore, electron withdrawing groups (EWG) like - NO2 which stabilize the phenoxide ion more by dispersing the negative charge will tend to increase the acidity of phenols.

                  

On the other hand, electron donating groups (EDG) like-alkyl group destabilize the phenoxide ion by intensifying the negative charge relative to phenol tend to decrease the acidic strength of phenols.

                   

As methyl group has + / effect and it is stronger at o-position than at p-position, (+ I effect decreases with distance) o-cresol is a weaker acid than p-cresol. Thus, the order of acidic strength.
                             p- nitrophenol > phenol > p- resol > o-cresol


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228.

(ii) H3O+(i) CH3MgBr R (i) dil. NaOH

4-methylpent-3-en-2-one P is

  • propanone

  • ethanamine

  • ethanenitrile

  • ethanal


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229.

When CH2=CH-O-CH2-CH3 reacts with one mole of HI, one of the products formed is

  • ethane

  • ethanol

  • iodoethene

  • ethanal


230.

0.44 g of a monohydric alcohol when added to methylmagnesium iodide in ether liberates at STP, 112 cm3 of methane. With PCC the same alcohol forms a carbonyl compound that answers silver mirror test. The monohydric alcohol is

  • H3C-CH(OH)-CH2-CH3

  • (CH3)3C-CH2OH

  • H3C-CH(OH)-CH2-CH2-CH3

  • (CH3)2CH-CH2OH


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