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(A) : Phenols are more acidic than alcoh...

(A) : Phenols are more acidic than alcohols.
(R): Phenoxide ion is more stable than alkoxide ion due to resonance.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

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The correct Answer is:
A
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Why phenol molecule is less stable than phenoxide ion ?

(A) Phenol undergoes Kolbe's reaction but not ethanol. (R) Phenoxide ion is a weaker base than ethoxide ion.

(A) The pka of acetic acid is lower than that of phenol. (R) Phenoxide ion is more resonance stabilised than acetate ion.

AAKASH SERIES-ALCOHOLS, PHENOLS AND ETHERS-ETHERS (OBJECTIVE EXERCISE-4)
  1. (A) For the reduction of esters in to alcohols Ni//H2 is preferred tha...

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  2. (A) Dichloro carbene acts as electrophile in Reimer-Tiemann reaction. ...

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  3. (A) : Phenols are more acidic than alcohols. (R): Phenoxide ion is m...

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  4. (A) In methanol C-O bond length is 1.42Å, but in phenol, it is 1.36Å. ...

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  5. (A) o-Nitrophenol is less soluble in water than the m- and p-isomers o...

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  6. (A) Phenol undergoes Kolbe's reaction but not ethanol. (R) Phenox...

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  7. (A) Phenols are acidic & react with alkalies like NaOH but do not reac...

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  8. (A) Presence of electron withdrawing groups at p-position, increases t...

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  9. (A) Both phenol and phenoxide ion exhibit resonance, phenoxide ion is ...

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  10. (A) Phenol and benzoic acid are distinguished with NaHCO3 solution ...

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  11. (A) O and p nitro phenols are separated by steam distillation (R)...

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  12. (A) Reimer Tiemann reactions of phenol with chloroform in alkali produ...

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  13. (A): Ethers behave as bases in the presence of mineral acids. (R): O...

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  14. (A):Ethers are relatively inert when compared to C(2)H(5)OH. (R): In...

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  15. (A): (CH(3))(3)C-ONa and CH(3)Br react together to form (CH(3))(3)C-O-...

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  16. (A) IUPAC name of the compound CH3 - undersetoverset(|)(CH3)(C)H -...

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  17. (A) Ditertiarybutyl ether cannot be prepared by Williamson's synthesis...

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  18. (A) The major products formed by heating (R) Para amino benzy...

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  19. (A) Anisole undergoes electrophilic substitution reaction at ortho & p...

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  20. (A) Phenetole on cleavage with HI gives phenol & ethyl iodide (R)...

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