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Alcohols, Phenols and Ethers

NEET (UG) 2022 (Phase 2)MCQEasy📈 Topic in 12% papers+4−1
Ques. 1NEET (UG) 2022 (Phase 2)

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

Answer

(4) [figure] , NaOH, STP condition

Solution

(1) Benzene oleum benzenesulphonic acid NaOH sodium phenoxide H3O+ phenol — correct.

(2) Aniline NaNO2 + HCl benzenediazonium chloride H2O, warm phenol — correct.

(3) Cumene O2 cumene hydroperoxide H3O+ phenol + acetone — correct.

(4) As per NCERT, chlorobenzene gives sodium phenoxide with NaOH only at 623 K and 300 atm, because the C–Cl bond has partial double bond character. At STP no reaction occurs.

∴ Method (4) is incorrect.

Answer: (4)

Keep practising — Alcohols, Phenols and Ethers

Ques. 2NEET (UG) 2021

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
Ques. 3NEET (UG) 2020

Anisole on cleavage with HI gives :

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

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
Ques. 5NEET (UG) 2019

The compound that is most difficult to protonate is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 6NEET (UG) 2019

The structure of intermediate A in the following reaction, is : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 7NEET 2018

The compound A on treatment with Na gives B, and with PCl5 gives C. B and C react together to give diethyl ether. A, B and C are in the order

  1. C2H5OH, C2H6, C2H5Cl
  2. C2H5OH, C2H5Cl, C2H5ONa
  3. C2H5Cl, C2H6, C2H5OH
  4. C2H5OH, C2H5ONa, C2H5Cl
Ques. 8NEET 2018

In the reaction, [figure] the electrophile involved is

  1. dichloromethyl cation ( CHCl2)
  2. formyl cation ( CHO)
  3. dichloromethyl anion ( CHCl2)
  4. dichlorocarbene (:CCl2)
Ques. 9NEET 2018

Identify the major products P, Q and R in the following sequence of reactions : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 10NEET 2017

The heating of phenyl methyl ether with HI produces

  1. iodobenzene
  2. phenol
  3. benzene
  4. ethyl chloride.
Ques. 11NEET 2017

Which one is the most acidic compound?

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

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