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 Multiple Choice QuestionsMultiple Choice Questions

31.

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

  • None of these


A.

CH CH reacts with acetic acid in presence of Hg2+ to give CH3 - CH(CH3COO)2.

CH CH + CH3COOH Hg2+ CH2CHOOCCH3Vinyl acetate Hg(OOCCH3)2CH3COOH  CH3-CH(OOCCH3)2Ethylidene diacetate


32.

Phenol and benzoic acid are distinguished by :

  • NaOH

  • NaHCO3

  • Na2CO3

  • H2SO4


B.

NaHCO3

Phenol and benzoic acid can be distinguished by NaHCO3 because only stronger acid reacts with sodium bicarbonate .


33.

The major product formed in the following reaction is

CH2CH(Cl)CH2-CH2OH aq. KOH

  • CH3CH = CH- CH2OH

  • CH2=CH- CH2- CH2OH

  • CH3-CH|OH-CH2-CH2OH


C.

CH3-CH|OH-CH2-CH2OH

Halogenated compounds on treatment with aq. KOH form alcohols. The halogen atom is substituted by= OH group.

CH3CH(Cl)CH2-CH2OH aq. KOHCHCH(OH)CH2-CH2OH

HerE OH acts as a nucleophile.


34.

Which of the following will not react with NaOH?

  • C2H5OH

  • CH3CONH2

  • CH(CN)3


B.

C2H5OH

C2H5OH or ethanol is a weak acid. Hence, it does not react with NaOH. However, it reacts with metallic sodium.


35.

Propionic acid and KOH reacts to produce which one of the following ?

  • Potassium propionate

  • Propyl alcohol

  • Propionaldehyde

  • Does not react


A.

Potassium propionate

Propionic acid and KOH reacts to produce potassium propionate.

CH3CH2COOHPropionic acid KOH CH3CH2COOKPotassium propionate + H2O


36.

lsopropyl benzene on air oxidation in the presence of dilute acid gives

  • C6H5COOH

  • C6H5COCH3

  • C6H5CHO

  • C6H5OH.


D.

C6H5OH.

lsopropyl benzene or cumene on air oxidation in presence of dilute acid gives phenol.


37.

Which gives only mono - substituted product ?

  • o - dinitrobenzene

  • m - dinitrobenzene

  • p - dinitrobenzene

  • Nitrobenzene


B.

m - dinitrobenzene

m - dinitrobenzene gives only mono - substituted product because - NO2 group is meta directing group and only one m - position is possiblein m - dinitrobenzene .


38.

In which of the following reactions carbon-carbon bond formation takes place ?

  • Cannizaro

  • Reimer - Tiemann

  • HVZ reaction

  • Schmidt reaction


B.

Reimer - Tiemann

Reimer - Tiemann reaction involves refluxing of phenol with chlorofom , and alkali .The main product is salicylaldehyde .In this reaction carbon-carbon bond formation takes place .


39.

Industrial name for H2S2O7 is :

  • Pyrosulphuric acid

  • Marshall's acid

  • Oleum

  • All of the above


C.

Oleum

Pyrosulphuric acid or H2S2O7 is industrially known as oleum. 


40.

.


A.

Phenol couples with benzene diazonium chloride in slightly basic medium to form a brillant red coloured azo dye .

p - hydroxy azobenzene (Brillant red dye)