Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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51.

What is the name of the following reaction?

PhCHO + (CH3CO)2Na(OAc)2 PhCH = CHCO2H

  • Oxymercuration demercuration reaction

  • Cannizzaro reaction

  • Knoevenagel's reaction

  • Perkin reaction


D.

Perkin reaction

The above reaction is Perkin reaction. It is an organic reaction which is used for the synthesis of α , β unsaturated aromatic acid by the condensation of an aromatic aldehyde and and acid anhydride.


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52.

Arrange X, Y and Z in order of increasing acidic strengths.

  • X > Z > Y

  • Z < X < Y

  • X > Y > Z

  • Z > X > Y


53.

Arrange the following monomers in order of decreasing ability to undergo cationic polymerisation.

I. CH2 = CH - C6H4(NO2)
II. CH2 = CH - C6H4(CH3)
III. CH2 = CH - C6H4(OCH3)

  • I > II > III

  • II > I > III

  • III > II > I

  • I > III > II


54.

Assertion : Oxidation of 1-nitronaphthalene gives o-nitrophthalic acid whereas 1-amino naphthalene on oxidation gives phthalic acid.

Reason : An amino group attached to the benzene ring makes it resistant to oxidation whereas nitro group makes the benzene ring susceptible to oxidation.

  • 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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55.

Assertion : Benzene reacts with iodine monochloride in presence of anhyd. AlCl3 to form iodobenzene.

Reason : Iodine monochloride reacts with anhyd. AlCl3 to produce I+ which attacks the benzene ring.

  • 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: Phenol forms 2, 4, 6-tribromophenol on treatment with Br2- water at 273 K.

Reason : Phenol is o, p- directing group.

  • 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: Aromatic aldehydes and formaldehyde undergo Cannizzaro reaction.

Reason : Aromatic aldehydes are almost as reactive as formaldehyde.

  • 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.


58.

Assertion : Activity of an enzyme is pH-dependent.

Reason : Change in pH affects the solubility of the enzyme in water.

  • 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 : Nucleotides are phosphate esters ofnucleosides.

Reason : The various nucleotides in nucleic acids are linked either through purine or pyrimidine bases.

  • 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 : Sulpha drugs contain sulphonamide group.

Reason : Salvarsan is a sulpha drug

  • 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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