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Which of the following is the weakest ac...

Which of the following is the weakest acid?

A

`p-` Aminophenol

B

`m-` Aminophenol

C

`o-` Aminophenol

D

Phenol

Text Solution

Verified by Experts

The correct Answer is:
A

in the ortho and para positions, `NH_(2)` is electron donating by resonance and is acid weakening. In the meta position it is only electron withdrawing and acid strengthening by induction. Thus, m-aminophenol is expected to be strongest acid but the decreasing order of acid strength is

o- aminophenol is the strongest acid because its phenoxide ion is stabilized by intramolecular hydrogen bonding

`p-` Aminophenol is the weakest acid on acoount of least-`I_(effect*)`.
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Knowledge Check

  • Which of the following is the weakest bond?

    A
    Hydrogen bond
    B
    Covalent bond
    C
    Ionic bond
    D
    Metallic bond

  • Which of the following is the weakest base

    A
    NaOH
    B
    `Ca(OH)_(2)`
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    `NH_(4)OH`
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  • Which of the following is the weakest base?

    A
    `NH_3`
    B
    `C_6H_5NH_2`
    C
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    D
    `CH_3NH_2`
    • R SHARMA-ALCOHOL, PHENOL AND ETHERS-PHENOLS (II)
    1. Which of the following is the weakest acid?

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    2. Arrange the following compounds in order of decreasing acidic strength...

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    3. Sodium benzenesulphonate is fused with solid NaOH and then acididfied ...

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    4. Which of he following does not possess a carboxy group?

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    5. Which of the following compounds produces a violet colour on addition ...

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    6. Salicylic acid on heating with soda lime gives

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    7. When phenol is treated with a solution of Br(2) in carbon disulphide a...

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    8. The reaction is an example of

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    9. Which of the following staments is correct regarding the solubilities ...

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    10. Phenol on being heated with concentrated H(2)SO(4) and then with conce...

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    11. A mixture of benzoic acid and phenol may be separated by treatment wit...

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    12. Phenol can be converted into salicylic acid by heating with

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    13. The major product obtanined on interaction of phenol with sodium hydr...

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    14. Which of the following does not liberate CO(2) from NaHCO(3).

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    15. When phenol is heated with CHCl(3) and alcoholic KOH, salicylaldehyde ...

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    16. Increasing order of acidic strength among p-methoxyphenol (i)p-methylp...

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    17. The boiling point of p-nitrophenol is higher than that of o-nitropheno...

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    18. Isopropylbenzene on air oxidation in the presence of dilute acid gives

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    19. Phenol can be distinguished from ethanol by the following reagents exc...

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    20. The compound used to manufacture phenol is

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