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Alcohols, Phenols and Ethers

JEE Main 2024 (Online) 27th January Morning ShiftMCQMedium📈 Topic in 12% papers+4−1
Ques. 1JEE Main 2024, 27 January (Morning Shift)

The ascending order of acidity of -OH group in the following compounds is : [figure] Choose the correct answer from the options given below:

  1. (A) < (D) < (C) < (B) < (E)
  2. (C) < (A) < (D) < (B) < (E)
  3. (C) < (D) < (B) < (A) < (E)
  4. (A) < (C) < (D) < (B) < (E)

Answer

(4) (A) < (C) < (D) < (B) < (E)

Solution

Acidity ∝ stability of the conjugate base (RO- / ArO-):

(A): Bu–O⁻ has no resonance, +I of butyl ⇒ (A) least acidic (pKa ≈ 16)

(C): –OMe at p gives +R ⇒ destabilises phenoxide ⇒ (C) below phenol (10.2)

(D): phenoxide resonance stabilised ⇒ (D) phenol (10.0)

(B): one p-NO2 (−R, −I) ⇒ (B) more acidic (7.1)

(E): two NO2 (o and p) ⇒ (E) most acidic (4.0)

∴ (A) < (C) < (D) < (B) < (E)

Answer: (4)

Keep practising — Alcohols, Phenols and Ethers

Ques. 2JEE Main 2024, 27 January (Evening Shift)

Major product formed in the following reaction is a mixture of : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 3JEE Main 2024, 27 January (Evening Shift)

Match List - I with List - II. Choose the correct answer from the options given below :

  1. (A)-(II), (B)-(I), (C)-(III), (D)-(IV)
  2. (A)-(IV), (B)-(I), (C)-(III), (D)-(II)
  3. (A)-(IV), (B)-(III), (C)-(I), (D)-(II)
  4. (A)-(II), (B)-(III), (C)-(I), (D)-(IV)
Ques. 4JEE Main 2024, 27 January (Evening Shift)

The final product A, formed in the following reaction sequence is: [figure]

  1. [figure]
  2. [figure]
  3. Ph-CH2-CH2-CH2-OH
  4. Ph-CH2-CH2-CH3

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