Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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51.

Aromatic nitriles (ArCN) are not prepared by reaction:

  • ArX + KCN

  • ArN2++ CuCN

  • ArCONH2+ P2O5

  • ArCONH2+ SOCl2


A.

ArX + KCN

Halogen have +I and +M effect by which its electron delocalized in benzene ring by resonance and due to its +I effect its bonded with benzene ring and cannot be substitute bt CN- and show the inertness against KCN while other option gives aromatic nitrile .            

ArN2+ + CuCN ArCN +N2 +Cu+ArCONH2 H2OP2O5 ArCNArCONH2 + SOCl2  ArCN + SO2 + 2HCl

                          OR

(Aryl halides (ArX) does not undergo nucleophilic substitution because they have strong Cbond due to resonance.)

 


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52.

Melting points are normally the highest for

  • tertiary amides

  • secondary amides

  • primary amides

  • amines.


53.

The most suitable reagent for the conversion of

RCH2OH  RCHO is

  • KMnO4

  • K2Cr2O7

  • CrO3

  • PCC (pyridine chloro chromate).


54.

Which of the following is a biodegradable polymer?

  • Cellulose

  • Polythene

  • Polyvinyl chloride

  • Nylon-6


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55.

Assertion : Carboxypeptidase is an exopeptidase.

Reason : It cleaves the N-terminal bond.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


56.

Assertion : Sucrose is a non-reducing sugar.

Reason : It has glycosidic linkage.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false


57.

Assertion : lsobutanal does not give iodofonn test.

Reason : It does not have α-hydrogen.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


58.

Assertion : 2-bromobutane on reaction with sodium ethoxide in ethanol gives 1-butene as a major product.

Reason : 1-butene is more stable than 2-butene.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


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59.

Assertion : The major products formed by heating C6H5CH2OCH, with HI are C6H5CH2I and CH3OH.

Reason : Benzyl cation is more stable than methyl cation.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


60.

Assertion : Molar entropy of vaporisation of water is different from ethanol.

Reason : Water is more polar than ethanol.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


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