Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

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

  • CH2ClCCl3

  • CCl3NO2

  • CH2(CH3)CH2Cl

  • CHI3


B.

CCl3NO2

The chloropicrin is trichloro , nitro methane ,

i.e , CCl3NO2 .


52.

 Soda lime A ? Anisole

Reagent in second step should be :

  • CH3Cl

  • KOH + C2H5OH

  • KOH + C2H5SH

  • KOH + Cl2


B.

KOH + C2H5OH


53.

Artificial silk is :

  • nylon - 6

  • rayon

  • nylon 66

  • none of these


B.

rayon

Artificial silk is rayon .


54.

Identify the product Y in the sequence :

CH3CHO + CH3MgI Ether X H2O/H+ Y , is

  • CH3OH

  • CH3CH2OH

  • (CH3)2CHOH

  • (CH3)3COH


C.

(CH3)2CHOH

CH3CHO + CH3MgI Ether (CH3)2CH-OMgI (X) Hydrolysis (CH3)2CHOH (Y)


55.

An ester linkage is present in :

  • nylon - 6

  • nylon - 6 , 6

  • dacron

  • rayon


C.

dacron

The ester linkage is present in dacron

(terylene or dacron)


56.

Lecithin is an example of :

  • carbohydrate

  • hormones

  • vitamins

  • phospholipid


D.

phospholipid

Lecithin is an example of phospholipids .

Structure of lecithin is ;


57.

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


C.

acetic anhydride

Two moles of acetic acid (Ethanoic acid) are heated with P2O5 , product formed is acetic anhydride .P2O5 act as dehydrating agent .

 P2O5 


58.

Williamson's synthesis involves :

  • SN1 mechanism

  • nucleophilic addition

  • SN2 mechanism

  • SE  mechanism


C.

SN2 mechanism

Williamson's synthesis : A reaction in which sodium or potasium alkoxide is heated with an alkyl halide to give ether by the reaction sample as well as mixed ethers can be prepared .This is an example of nucleophilic substitution and follows SN2 mechanism .

RONa + XR  RORsimple + NaXether

RONa + XR'  R-O-R'mixed ether + NaX


59.

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


60.

Which of the following is common example of fibres ?

  • Bakelite

  • Buna - S

  • Nylon - 66

  • PVC


C.

Nylon - 66

Nylon - 66 also known as common fibres because it is used in the manufacturing carpets , textile fibres .