The reaction , ROH + H2CN2 in the presence of HBF4 , gi

Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

An ester linkage is present in :

  • nylon - 6

  • nylon - 6 , 6

  • dacron

  • rayon


52.

Williamson's synthesis involves :

  • SN1 mechanism

  • nucleophilic addition

  • SN2 mechanism

  • SE  mechanism


53.

Chloropicrin is used as an insecticide and has been used as tear war gas .The chloropicrin is :

  • CH2ClCCl3

  • CCl3NO2

  • CH2(CH3)CH2Cl

  • CHI3


54.

 Soda lime A ? Anisole

Reagent in second step should be :

  • CH3Cl

  • KOH + C2H5OH

  • KOH + C2H5SH

  • KOH + Cl2


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55.

Identify the product Y in the sequence :

CH3CHO + CH3MgI Ether X H2O/H+ Y , is

  • CH3OH

  • CH3CH2OH

  • (CH3)2CHOH

  • (CH3)3COH


56.

Two moles of acetic acid are heated with P2O5 .The product formed is :

  • 2 moles of ethyl alcohol

  • formic anhydride

  • acetic anhydride

  • 2 moles of methyl cyanide


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57.

The reaction , ROH + H2CNin the presence of HBF4 , gives the following product :

  • ROCH3

  • RCH2OH

  • ROHCN2N2

  • RCH2CH3


A.

ROCH3

In the presence of tetrafluoroboric acid , alcohols react with diazomethane (CH2N2) to form methyl ethers in excellent yield .

ROHalcohol + CH2N2diazo methane HBF4 ROCH3methoxy ethane (ether) + N2


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58.

Lecithin is an example of :

  • carbohydrate

  • hormones

  • vitamins

  • phospholipid


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59.

Artificial silk is :

  • nylon - 6

  • rayon

  • nylon 66

  • none of these


60.

Which of the following is common example of fibres ?

  • Bakelite

  • Buna - S

  • Nylon - 66

  • PVC


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