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Alcohols, Phenols and Ethers · Question 13

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

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)

NEET (UG) 2022 (Phase 2)

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2

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
3

Anisole on cleavage with HI gives :

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

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
5

The compound that is most difficult to protonate is :

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

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2019
7

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
NEET 2018
8

In the reaction, [figure] the electrophile involved is

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

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET 2018
10

The heating of phenyl methyl ether with HI produces

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

Which one is the most acidic compound?

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

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