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Alcohols, Phenols and Ethers · Question 7

NEET (UG) 2023MCQMedium📈 Topic in 38% papers+4−1
1

Consider the following reaction and identify the product (P). [figure] 3-Methylbutan-2-ol

  1. CH3CH=CH-CH3
  2. [figure]
  3. [figure]
  4. [figure]

Answer

(4) [figure]

Solution

The reaction follows the SN1 path. Protonation and loss of water give a 2° carbocation:

(CH3)2CH-CH(OH)-CH3 H+, -H2O (CH3)2CH- CH-CH3

A 1,2-hydride shift gives the more stable 3° carbocation:

(CH3)2CH- CH-CH3 (CH3)2 C-CH2-CH3

Br- attacks the 3° carbocation, giving 2-bromo-2-methylbutane:

(CH3)2 C-CH2-CH3 + Br- (CH3)2CBr-CH2-CH3

Answer: (4)

NEET (UG) 2023

Keep practising — Alcohols, Phenols and Ethers

2

Consider the following reaction [figure] Identify products A and B :-

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2023
3

Which amongst the following will be most readily dehydrated under acidic conditions?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2023
4

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

  1. Both Statement I and Statement II are correct.
  2. Both Statement I and Statement II are incorrect.
  3. Statement I is correct but Statement II is incorrect.
  4. Statement I is incorrect but Statement II is correct.
NEET (UG) 2022
5

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

  1. Both Statement I and Statement II are correct
  2. Both Statement I and Statement II are incorrect
  3. Statement I is correct but Statement II is incorrect
  4. Statement I is incorrect but Statement II is correct
NEET (UG) 2022
6

Match the reagents (List-I) with the product (List-II) obtained from phenol. Choose the correct answer from the options given below :

  1. (a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)
  2. (a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)
  3. (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)
  4. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
NEET (UG) 2022 (Phase 2)
7

Which one of the following reaction sequence is incorrect method to prepare phenol?

  1. [figure] , oleum, NaOH, H3O+
  2. Aniline, NaNO2 + HCl, H2O, heating
  3. Cumene, O2, H3O+
  4. [figure] , NaOH, STP condition
NEET (UG) 2022 (Phase 2)
8

What is the IUPAC name of the organic compound formed in the following chemical reaction? Acetone [(ii) H2O, H+](i) C2H5MgBr, Dry ether product

  1. 2-methylbutan-2-ol
  2. 2-methylpropan-2-ol
  3. pentan-2-ol
  4. pentan-3-ol
NEET (UG) 2021
9

Anisole on cleavage with HI gives :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2020
10

Reaction between acetone and methylmagnesium chloride followed by hydrolysis will give :

  1. Sec. butyl alcohol
  2. Tert. butyl alcohol
  3. Isobutyl alcohol
  4. Isopropyl alcohol
NEET (UG) 2020
11

The compound that is most difficult to protonate is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2019

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