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Alcohols, Phenols and Ethers · Question 14

NEET (UG) 2021MCQEasy📈 Topic in 25% papers+4−1
1

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

Answer

(1) 2-methylbutan-2-ol

Solution

As per NCERT, Grignard reagent adds to a ketone and hydrolysis gives a tertiary alcohol.

(CH3)2C=O + C2H5MgBr dry ether (CH3)2C(OMgBr)C2H5

(CH3)2C(OMgBr)C2H5 H2O, H+ (CH3)2C(OH)CH2CH3

Longest chain 4 C, OH and CH3 on C-2 ⇒ 2-methylbutan-2-ol

Answer: (1)

NEET (UG) 2021

Keep practising — Alcohols, Phenols and Ethers

2

Anisole on cleavage with HI gives :

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

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
4

The compound that is most difficult to protonate is :

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2019
5

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

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

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
7

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
8

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
9

The heating of phenyl methyl ether with HI produces

  1. iodobenzene
  2. phenol
  3. benzene
  4. ethyl chloride.
NEET 2017
10

Which one is the most acidic compound?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET 2017
11

The reaction [figure] can be classified as

  1. dehydration reaction
  2. Williamson alcohol synthesis reaction
  3. Williamson ether synthesis reaction
  4. alcohol formation reaction.
NEET 2016 (Phase 1)

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