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 Multiple Choice QuestionsMultiple Choice Questions

151.

Which one is the most acidic compound?


D.

–NO2 group has very strong –I & –R effects

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152.

Identify A and predict the type of reaction


A.

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153.

The product (P) is


A.

This is an example of Williamson's synthesis.


154.

Assertion : Phenol is more acidic than ethanol.

Reason : Phenoxide ion is resonance stabilised.

  • 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.


A.

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

Due to stabilised resonance of phenoxide ion, phenol is more acidic than ethanol.


155.

Which one is the correct order of acidity?

  • CH2= CH2> CH3– CH = CH2> CH3– C ≡ CH > CH ≡ CH

  • CH ≡  CH > CH3– C ≡  CH > CH2= CH2> CH3– CH3

  • CH ≡ CH > CH2= CH2> CH3– C ≡  CH >CH3– CH3

  • CH ≡ CH > CH2= CH2> CH3– C ≡  CH >CH3– CH3


B.

CH ≡  CH > CH3– C ≡  CH > CH2= CH2> CH3– CH3

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156.

The acidic strength of the given compounds follows the order

I. CH3-CH=CH-COOH

II. CH3-O....-CH=CH-COOH

III. CH3=CH2-COOH

  • II > III > I

  • III > II > I

  • II > I > III

  • I > II > III


D.

I > II > III

The correct order of the acidic strength in the given compounds is I > II > III.


157.

 Phenol (ii) CO2/140o C(i) NaOHA H+/H2O BAc2OC

In the above reaction, end product 'C' is

  • Salicylaldehyde

  • Salicyclic acid

  • Phenylacetate

  • Aspirin


D.

Aspirin


158.

The heating of phenyl-methyl ethers with HI produces.

  • Ethyl chlorides

  • Iodobenzene

  • Phenol

  • Phenol


C.

Phenol

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159.

The reaction,

C6H5ONa + CO2 +H2C6H5OH + NaHCO3 suggests that

  • phenol is a stronger acid than carbonic acid

  • carbonic acid is a stronger acid than phenol

  • water is a stronger acid than phenol

  • None of these.


B.

carbonic acid is a stronger acid than phenol

Since a stronger acid displaces a weaker acid from its salts, therefore, carbonic acid(CO2 + H2O = H2CO3) is a stronger acid than phenol.


160.

Aqueous 10% NaHCO3 solution is used as a reagent for identifying 'A'. Which of the following compounds yield 'A' on hydrolysis?

  • CH3COOC2H5

  • C2H5-COO-C2H5

  • CH3CHO

  • CH3CH2OH


A.

CH3COOC2H5

NaHCO3 is basic in nature so it is used in the identification of acid only. In the given compound only ester (CH3COOC2H5) on hydrolysis gives acid as

CH3COOC2H5 + H2O  CH3COOHAcetic acid + C2H5OHEthyl alcohol