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Alcohols, Phenols and Ethers

JEE Main 2025 (Online) 4th April Evening ShiftMCQMedium📈 Topic in 3% papers+4−1
Ques. 1JEE Main 2025, 4 April (Evening Shift)

A toxic compound "A" when reacted with NaCN in aqueous acidic medium yields an edible cooking component and food preservative "B". "B" is converted to "C" by diborane and can be used as an additive to petrol to reduce emission. "C" upon reaction with oleum at 140 C yields an inhalable anesthetic "D". Identify "A", "B", "C" & "D", respectively :

  1. Methanol; acetic acid; ethanol; diethyl ether
  2. Ethanol; acetonitrile; ethylamine; ethylene
  3. Methanol; formaldehyde; methyl chloride; chloroform
  4. Acetaldehyde; 2-hydroxypropanoic acid; propanoic acid; dipropyl ether

Answer

(1) Methanol; acetic acid; ethanol; diethyl ether

Solution

B: edible cooking component and food preservative = acetic acid (vinegar), CH3COOH.

A: toxic methanol; its CH3 group is converted into CH3CN by cyanide, and the nitrile is hydrolysed in aqueous acidic medium to acetic acid:

CH3OH CH3CN H3O+ CH3COOH

C: diborane reduces –COOH to –CH2OH:

CH3COOH [(ii) H3O+](i) B2H6 CH3CH2OH (ethanol, blended with petrol)

D: dehydration of ethanol with conc. H2SO4 at 413 K (140 C):

2C2H5OH H2SO4, 413 K C2H5-O-C2H5 + H2O

Diethyl ether was used as an inhalation anaesthetic.

A, B, C, D = methanol, acetic acid, ethanol, diethyl ether.

Answer: (1)

Keep practising — Alcohols, Phenols and Ethers

Ques. 2JEE Main 2025, 29 January (Evening Shift)

Which one of the following, with HBr will give a phenol?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 3JEE Main 2025, 23 January (Evening 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 false but Statement II is true
  2. Both Statement I and Statement II are true
  3. Statement I is true but Statement II is false
  4. Both Statement I and Statement II are false
Ques. 4JEE Main 2025, 23 January (Evening Shift)

Identify the products [A] and [B], respectively in the following reaction: [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 5JEE Main 2024, 9 April (Morning Shift)

Identify the product A and product B in the following set of reactions. [figure]

  1. A - CH3CH2CH2-OH B - CH3 OH |CH-CH3
  2. A - CH3- OH |CH-CH3 B - CH3CH2CH2-OH
  3. A - CH3CH2CH2-OH B - CH3CH2CH2-OH
  4. A - CH3CH2CH3 B - CH3CH2CH3
Ques. 6JEE 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)
Ques. 7JEE 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. 8JEE 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. 9JEE 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. 10JEE 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. 11JEE 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

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