QBManager

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323279 The ascending order of acidity of $-$ OH group in the following compounds is
(I) $Bu - OH$
(II) supporting img
(III
(IV)
(V)
Choose the correct answer from the options given below :

1 (III)

<

(I)

<

(IV)

<

(II)

<

(V)

2 (III)

<

(IV)

<

(II)

<

(I)

<

(V)

3 (I)

<

(IV)

<

(III)

<

(II)

<

(V)

4 (I)

<

(III)

<

(IV)

<

(II)

<

(V)

Explanation:

Presence of electron withdrawing groups enhances the acidity of phenols, while the presence of electron donating groups decreases the acidity of phenol. Alcohols are less acidic than phenols. So, the correct order is
I $<$ III $<$ IV $<$ II $<$ V.
So, correct option is (4).

JEE Main - 2024

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323248 Assertion :
Phenol is less acidic than p-nitrophenol.
Reason :
Phenolate ion is more stable than $p -$ nitrophenolate ion.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Phenol is less acidic than p-nitrophenol because the nitro group $({NO}_{2})$ in p-nitrophenol is a strong electron-withdrawing group. This makes the phenolate ion (the conjugate base of phenol) less stable. In contrast, the p-nitrophenolate ion (the conjugate base of p- nitrophenol) is more stable due to the presence of the nitro group. The increased stability of the p-nitrophenolate ion results in greater acidity for p-nitrophenol compared to phenol. So the option (3) is correct.

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323249 Which of the following will not be soluble in ${NaHCO}_{3}$ ?

1

o

-Nitrophenol

2 Benzene sulphonic acid

3 2, 4, 6- Trinitrophenol

4 Benzoic acid

Explanation:

supporting img
while 2, 4, 6 trinitrophenol, benzoic acid and benzene sulphonic acid are soluble in ${NaHCO}_{3}$ .
$Acid + {NaHCO}_{3} \to salt + H_{2} {CO}_{3}$
This reaction is possible in forward direction if acid is more acidic than $H_{2} {CO}_{3}$ . o-Nitrophenol is less acidic than $H_{2} {CO}_{3}$ . Hence, it is not soluble in sodium
hydrogen carbonate.

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323250 Read the Assertion and Reason carefully and mark correct option.
Assertion :
Order of acidic nature of the following compounds is $A > B > C$ .
supporting img
Reason :
Fluoro is a stronger electron withdrawing group than chloro group.

1 Assertion is false but Reason is true.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

3 Assertion is true but Reason is false.

4 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

Explanation:

Electron withdrawing groups increase acidic nature. Electron withdrawing nature of $F > Cl$ . But in compound B, F is at para position and cannot increase the acidic nature as much as chlorine can do at the ortho position. Thus, assertion is true, but reason is not the correct explanation.
So, the correct option is (2).

JEE - 2023

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323251 Phenol is

1 A base weaker than ammonia

2 An acid stronger than carbonic acid

3 An acid weaker than carbonic acid

4 A neutral compound

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323279 The ascending order of acidity of $-$ OH group in the following compounds is
(I) $Bu - OH$
(II) supporting img
(III
(IV)
(V)
Choose the correct answer from the options given below :

1 (III)

<

(I)

<

(IV)

<

(II)

<

(V)

2 (III)

<

(IV)

<

(II)

<

(I)

<

(V)

3 (I)

<

(IV)

<

(III)

<

(II)

<

(V)

4 (I)

<

(III)

<

(IV)

<

(II)

<

(V)

Explanation:

Presence of electron withdrawing groups enhances the acidity of phenols, while the presence of electron donating groups decreases the acidity of phenol. Alcohols are less acidic than phenols. So, the correct order is
I $<$ III $<$ IV $<$ II $<$ V.
So, correct option is (4).

JEE Main - 2024

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323248 Assertion :
Phenol is less acidic than p-nitrophenol.
Reason :
Phenolate ion is more stable than $p -$ nitrophenolate ion.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Phenol is less acidic than p-nitrophenol because the nitro group $({NO}_{2})$ in p-nitrophenol is a strong electron-withdrawing group. This makes the phenolate ion (the conjugate base of phenol) less stable. In contrast, the p-nitrophenolate ion (the conjugate base of p- nitrophenol) is more stable due to the presence of the nitro group. The increased stability of the p-nitrophenolate ion results in greater acidity for p-nitrophenol compared to phenol. So the option (3) is correct.

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323249 Which of the following will not be soluble in ${NaHCO}_{3}$ ?

1

o

-Nitrophenol

2 Benzene sulphonic acid

3 2, 4, 6- Trinitrophenol

4 Benzoic acid

Explanation:

supporting img
while 2, 4, 6 trinitrophenol, benzoic acid and benzene sulphonic acid are soluble in ${NaHCO}_{3}$ .
$Acid + {NaHCO}_{3} \to salt + H_{2} {CO}_{3}$
This reaction is possible in forward direction if acid is more acidic than $H_{2} {CO}_{3}$ . o-Nitrophenol is less acidic than $H_{2} {CO}_{3}$ . Hence, it is not soluble in sodium
hydrogen carbonate.

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323250 Read the Assertion and Reason carefully and mark correct option.
Assertion :
Order of acidic nature of the following compounds is $A > B > C$ .
supporting img
Reason :
Fluoro is a stronger electron withdrawing group than chloro group.

1 Assertion is false but Reason is true.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

3 Assertion is true but Reason is false.

4 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

Explanation:

Electron withdrawing groups increase acidic nature. Electron withdrawing nature of $F > Cl$ . But in compound B, F is at para position and cannot increase the acidic nature as much as chlorine can do at the ortho position. Thus, assertion is true, but reason is not the correct explanation.
So, the correct option is (2).

JEE - 2023

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323251 Phenol is

1 A base weaker than ammonia

2 An acid stronger than carbonic acid

3 An acid weaker than carbonic acid

4 A neutral compound

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323279 The ascending order of acidity of $-$ OH group in the following compounds is
(I) $Bu - OH$
(II) supporting img
(III
(IV)
(V)
Choose the correct answer from the options given below :

1 (III)

<

(I)

<

(IV)

<

(II)

<

(V)

2 (III)

<

(IV)

<

(II)

<

(I)

<

(V)

3 (I)

<

(IV)

<

(III)

<

(II)

<

(V)

4 (I)

<

(III)

<

(IV)

<

(II)

<

(V)

Explanation:

Presence of electron withdrawing groups enhances the acidity of phenols, while the presence of electron donating groups decreases the acidity of phenol. Alcohols are less acidic than phenols. So, the correct order is
I $<$ III $<$ IV $<$ II $<$ V.
So, correct option is (4).

JEE Main - 2024

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323248 Assertion :
Phenol is less acidic than p-nitrophenol.
Reason :
Phenolate ion is more stable than $p -$ nitrophenolate ion.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Phenol is less acidic than p-nitrophenol because the nitro group $({NO}_{2})$ in p-nitrophenol is a strong electron-withdrawing group. This makes the phenolate ion (the conjugate base of phenol) less stable. In contrast, the p-nitrophenolate ion (the conjugate base of p- nitrophenol) is more stable due to the presence of the nitro group. The increased stability of the p-nitrophenolate ion results in greater acidity for p-nitrophenol compared to phenol. So the option (3) is correct.

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323249 Which of the following will not be soluble in ${NaHCO}_{3}$ ?

1

o

-Nitrophenol

2 Benzene sulphonic acid

3 2, 4, 6- Trinitrophenol

4 Benzoic acid

Explanation:

supporting img
while 2, 4, 6 trinitrophenol, benzoic acid and benzene sulphonic acid are soluble in ${NaHCO}_{3}$ .
$Acid + {NaHCO}_{3} \to salt + H_{2} {CO}_{3}$
This reaction is possible in forward direction if acid is more acidic than $H_{2} {CO}_{3}$ . o-Nitrophenol is less acidic than $H_{2} {CO}_{3}$ . Hence, it is not soluble in sodium
hydrogen carbonate.

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323250 Read the Assertion and Reason carefully and mark correct option.
Assertion :
Order of acidic nature of the following compounds is $A > B > C$ .
supporting img
Reason :
Fluoro is a stronger electron withdrawing group than chloro group.

1 Assertion is false but Reason is true.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

3 Assertion is true but Reason is false.

4 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

Explanation:

Electron withdrawing groups increase acidic nature. Electron withdrawing nature of $F > Cl$ . But in compound B, F is at para position and cannot increase the acidic nature as much as chlorine can do at the ortho position. Thus, assertion is true, but reason is not the correct explanation.
So, the correct option is (2).

JEE - 2023

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323251 Phenol is

1 A base weaker than ammonia

2 An acid stronger than carbonic acid

3 An acid weaker than carbonic acid

4 A neutral compound

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323279 The ascending order of acidity of $-$ OH group in the following compounds is
(I) $Bu - OH$
(II) supporting img
(III
(IV)
(V)
Choose the correct answer from the options given below :

1 (III)

<

(I)

<

(IV)

<

(II)

<

(V)

2 (III)

<

(IV)

<

(II)

<

(I)

<

(V)

3 (I)

<

(IV)

<

(III)

<

(II)

<

(V)

4 (I)

<

(III)

<

(IV)

<

(II)

<

(V)

Explanation:

Presence of electron withdrawing groups enhances the acidity of phenols, while the presence of electron donating groups decreases the acidity of phenol. Alcohols are less acidic than phenols. So, the correct order is
I $<$ III $<$ IV $<$ II $<$ V.
So, correct option is (4).

JEE Main - 2024

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323248 Assertion :
Phenol is less acidic than p-nitrophenol.
Reason :
Phenolate ion is more stable than $p -$ nitrophenolate ion.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Phenol is less acidic than p-nitrophenol because the nitro group $({NO}_{2})$ in p-nitrophenol is a strong electron-withdrawing group. This makes the phenolate ion (the conjugate base of phenol) less stable. In contrast, the p-nitrophenolate ion (the conjugate base of p- nitrophenol) is more stable due to the presence of the nitro group. The increased stability of the p-nitrophenolate ion results in greater acidity for p-nitrophenol compared to phenol. So the option (3) is correct.

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323249 Which of the following will not be soluble in ${NaHCO}_{3}$ ?

1

o

-Nitrophenol

2 Benzene sulphonic acid

3 2, 4, 6- Trinitrophenol

4 Benzoic acid

Explanation:

supporting img
while 2, 4, 6 trinitrophenol, benzoic acid and benzene sulphonic acid are soluble in ${NaHCO}_{3}$ .
$Acid + {NaHCO}_{3} \to salt + H_{2} {CO}_{3}$
This reaction is possible in forward direction if acid is more acidic than $H_{2} {CO}_{3}$ . o-Nitrophenol is less acidic than $H_{2} {CO}_{3}$ . Hence, it is not soluble in sodium
hydrogen carbonate.

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323250 Read the Assertion and Reason carefully and mark correct option.
Assertion :
Order of acidic nature of the following compounds is $A > B > C$ .
supporting img
Reason :
Fluoro is a stronger electron withdrawing group than chloro group.

1 Assertion is false but Reason is true.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

3 Assertion is true but Reason is false.

4 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

Explanation:

Electron withdrawing groups increase acidic nature. Electron withdrawing nature of $F > Cl$ . But in compound B, F is at para position and cannot increase the acidic nature as much as chlorine can do at the ortho position. Thus, assertion is true, but reason is not the correct explanation.
So, the correct option is (2).

JEE - 2023

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323251 Phenol is

1 A base weaker than ammonia

2 An acid stronger than carbonic acid

3 An acid weaker than carbonic acid

4 A neutral compound

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323279 The ascending order of acidity of $-$ OH group in the following compounds is
(I) $Bu - OH$
(II) supporting img
(III
(IV)
(V)
Choose the correct answer from the options given below :

1 (III)

<

(I)

<

(IV)

<

(II)

<

(V)

2 (III)

<

(IV)

<

(II)

<

(I)

<

(V)

3 (I)

<

(IV)

<

(III)

<

(II)

<

(V)

4 (I)

<

(III)

<

(IV)

<

(II)

<

(V)

Explanation:

Presence of electron withdrawing groups enhances the acidity of phenols, while the presence of electron donating groups decreases the acidity of phenol. Alcohols are less acidic than phenols. So, the correct order is
I $<$ III $<$ IV $<$ II $<$ V.
So, correct option is (4).

JEE Main - 2024

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323248 Assertion :
Phenol is less acidic than p-nitrophenol.
Reason :
Phenolate ion is more stable than $p -$ nitrophenolate ion.

1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.

3 Assertion is correct but Reason is incorrect.

4 Assertion is incorrect but Reason is correct.

Explanation:

Phenol is less acidic than p-nitrophenol because the nitro group $({NO}_{2})$ in p-nitrophenol is a strong electron-withdrawing group. This makes the phenolate ion (the conjugate base of phenol) less stable. In contrast, the p-nitrophenolate ion (the conjugate base of p- nitrophenol) is more stable due to the presence of the nitro group. The increased stability of the p-nitrophenolate ion results in greater acidity for p-nitrophenol compared to phenol. So the option (3) is correct.

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323249 Which of the following will not be soluble in ${NaHCO}_{3}$ ?

1

o

-Nitrophenol

2 Benzene sulphonic acid

3 2, 4, 6- Trinitrophenol

4 Benzoic acid

Explanation:

supporting img
while 2, 4, 6 trinitrophenol, benzoic acid and benzene sulphonic acid are soluble in ${NaHCO}_{3}$ .
$Acid + {NaHCO}_{3} \to salt + H_{2} {CO}_{3}$
This reaction is possible in forward direction if acid is more acidic than $H_{2} {CO}_{3}$ . o-Nitrophenol is less acidic than $H_{2} {CO}_{3}$ . Hence, it is not soluble in sodium
hydrogen carbonate.

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323250 Read the Assertion and Reason carefully and mark correct option.
Assertion :
Order of acidic nature of the following compounds is $A > B > C$ .
supporting img
Reason :
Fluoro is a stronger electron withdrawing group than chloro group.

1 Assertion is false but Reason is true.

2 Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion.

3 Assertion is true but Reason is false.

4 Both Assertion and Reason are correct and Reason is the correct explanation of Assertion.

Explanation:

Electron withdrawing groups increase acidic nature. Electron withdrawing nature of $F > Cl$ . But in compound B, F is at para position and cannot increase the acidic nature as much as chlorine can do at the ortho position. Thus, assertion is true, but reason is not the correct explanation.
So, the correct option is (2).

JEE - 2023

CHXII11:ALCOHOLS, PHENOLS AND ETHERS

323251 Phenol is

1 A base weaker than ammonia

2 An acid stronger than carbonic acid

3 An acid weaker than carbonic acid

4 A neutral compound

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