Subject

Chemistry

Class

NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

Maximum decarboxylation occurs in

  • CH3COOH

  • C6H5COOH

  • C6H5CH2COOH

  • CH3COCH2COOH


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52.

The correct increasing order of reactivity for the following molecules towards electrophilic aromatic substitution is

  • I < IV < II < III

  • I < IV < II < IV

  • I < III < II < IV

  • I < III < IV < II


B.

I < IV < II < IV

The correct increasing order of reactivity is I < IV < II < III. This is because greater is the electron density on aromatic ring, greater is the reactivity towards electrophilic aromatic substitution.


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53.

The corrcet decreasing order of pKb is 

  • I > II > III > IV

  • III > IV > II > I

  • II > III > IV > I

  • IV > II > I > III


54.

The correct decreasing order of pKa is

  • II > IV > I > III

  • IV > II > III > I

  • III > II > IV > I

  • IV > I > II > III


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55.

SN2 reaction readily occurs in

  • CH3CH2-O-CH3

  • CH3-C(CH3)2-O-CH3

  • CH2=CH-CH2-O-CH3

  • Ph-CH2-O-CH2-CH3


56.

Assertion: Dehydration of alcohols always takes place in basic medium.

Reason : OH- is a better leaving 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 : Toluene in presence of UV rays forms benzaldehyde.

Reason : Dichlorotoluene is formed as an intermediate.

  • 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 : β-pleated sheet structure of protein shows maximum extension.

Reason : Intermolecular hydrogen bonding is present in them.

  • 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 : Fructose is a reducing sugar.

Reason : It has a ketonic 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.


60.

Assertion : p-Nitrophenol gives more electrophilic substituted compound than m-methoxyphenol.

Reason : Methoxy group shows only negative I-effect.

  • 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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