PYQSidePowered byPrepblink ExamsMy practice

Alcohols, Phenols and Ethers

JEE Main 2024 (Online) 9th April Morning ShiftMCQMedium📈 Topic in 12% papers+4−1
Ques. 1JEE Main 2024, 9 April (Morning Shift)

For the given compounds, the correct order of increasing pKa value : [figure] Choose the correct answer from the options given below :

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

Answer

BONUS

Solution

An electron-withdrawing group stabilises the phenoxide ion, so the phenol is a stronger acid and has a lower pKa.

(B) p-nitrophenol: –R and –I of -NO2 at para, pKa 7.1

(D) m-nitrophenol: only –I of -NO2 at meta, pKa 8.3

(C) m-methoxyphenol: at meta only –I of -OCH3 acts, pKa 9.6

(A) phenol: pKa = 10.0

(E) p-methoxyphenol: +R of -OCH3 at para destabilises the phenoxide, pKa 10.2

∴ increasing pKa: (B) < (D) < (C) < (A) < (E)

This order is not among the options (option (2) interchanges (A) and (C)), so no option is correct and the question is dropped.

Answer: Bonus (full marks to all who attempted)

Note: The official NTA answer key gives option (2). Our faculty team finds that no option is fully correct, so this question should be dropped (bonus: full marks to everyone who attempted it).

Keep practising — Alcohols, Phenols and Ethers

Ques. 2JEE Main 2024, 8 April (Morning Shift)

Identify the major products A and B respectively in the following set of reactions. [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 3JEE Main 2024, 8 April (Evening Shift)

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

  1. (A)-(II), (B)-(IV), (C)-(I), (D)-(III)
  2. (A)-(I), (B)-(IV), (C)-(II), (D)-(III)
  3. (A)-(III), (B)-(II), (C)-(I), (D)-(IV)
  4. (A)-(IV), (B)-(II), (C)-(III), (D)-(I)
Ques. 4JEE Main 2024, 8 April (Evening Shift)

Which one of the following compounds will readily react with dilute NaOH ?

  1. C6H5CH2OH
  2. C2H5OH
  3. C6H5OH
  4. (CH3)3COH
Ques. 5JEE Main 2024, 6 April (Morning Shift)

In Reimer - Tiemann reaction, phenol is converted into salicylaldehyde through an intermediate. The structure of intermediate is .

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 6JEE Main 2024, 6 April (Morning Shift)

Given below are two statements : In the light of the above statements, choose the most appropriate answer from the options given below :

  1. Statement I is incorrect but Statement II is correct
  2. Both Statement I and Statement II are incorrect
  3. Both Statement I and Statement II are correct
  4. Statement I is correct but Statement II is incorrect
Ques. 7JEE Main 2024, 6 April (Evening Shift)

Identify the product A in the following reaction. [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 8JEE Main 2024, 6 April (Evening Shift)

The major products formed : [figure] A and B respectively are :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 9JEE Main 2024, 6 April (Evening Shift)

[figure] The ratio of number of oxygen atoms to bromine atoms in the product Q is 10-1.

Ques. 10JEE Main 2024, 5 April (Morning Shift)

Given below are two statements : In the light of the above statements, choose the correct answer from the options given below :

  1. Statement I is true but Statement II is false
  2. Both Statement I and Statement II are true
  3. Statement I is false but Statement II is true
  4. Both Statement I and Statement II are false
Ques. 11JEE Main 2024, 5 April (Morning Shift)

Identify compound (Z) in the following reaction sequence. [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

All Alcohols, Phenols and Ethers PYQs →

PDFDownload Alcohols, Phenols and Ethers PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All JEE Main Chemistry chapters