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Alcohols, Phenols and Ethers · Question 20

NEET 2018MCQEasy📈 Topic in 12% papers+4−1
1

In the reaction, [figure] the electrophile involved is

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

Answer

(4) dichlorocarbene (:CCl2)

Solution

This is the Reimer–Tiemann reaction.

The base removes a proton from chloroform: CHCl3 + OH CCl3 + H2O

⇒ CCl3 :CCl2 + Cl

Dichlorocarbene (electron-deficient carbon with only six electrons) attacks the electron-rich ortho position of the phenoxide ion; hydrolysis of the -CHCl2 group then gives -CHO.

The electrophile is dichlorocarbene, :CCl2.

Answer: (4)

NEET 2018

Keep practising — Alcohols, Phenols and Ethers

2

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
3

The heating of phenyl methyl ether with HI produces

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

Which one is the most acidic compound?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET 2017
5

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)
6

Which of the following is not the product of dehydration of [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2015
7

Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group?

  1. -COOH
  2. -CHCl2
  3. -CHO
  4. -CH2Cl
AIPMT 2015
8

The reaction, [figure] is called

  1. Etard reaction
  2. Gattermann-Koch reaction
  3. Williamson synthesis
  4. Williamson continuous etherification process
AIPMT 2015 (Cancelled)
9

Identify Z in the sequence of reactions: CH3CH2CH=CH2 HBr/H2O2 Y C2H5ONa Z

  1. CH3-(CH2)3-O-CH2CH3
  2. (CH3)2CH-O-CH2CH3
  3. CH3(CH2)4-O-CH3
  4. CH3CH2-CH(CH3)-O-CH2CH3
AIPMT 2014
10

Among the following sets of reactants which one produces anisole?

  1. CH3CHO ; RMgX
  2. C6H5OH ; NaOH ; CH3I
  3. C6H5OH ; neutral FeCl3
  4. C6H5CH3 ; CH3COCl ; AlCl3
AIPMT 2014
11

Which of the following will not be soluble in sodium hydrogen carbonate?

  1. 2,4,6-Trinitrophenol
  2. Benzoic acid
  3. o-Nitrophenol
  4. Benzenesulphonic acid
AIPMT 2014

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