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Alcohols, Phenols and Ethers

NEET 2017MCQEasy📈 Topic in 25% papers+4−1
Ques. 1NEET 2017

Which one is the most acidic compound?

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

Answer

(3) [figure]

Solution

Acidity of a phenol depends on the stability of its phenoxide ion.

∵ -NO2 at ortho/para positions withdraws electrons (-I and -R effects) and disperses the negative charge of the phenoxide ion ⇒ acidity increases.

∵ -CH3 is electron releasing ⇒ it destabilises the phenoxide ion ⇒ acidity decreases.

As per NCERT, pKa values: 2,4,6-trinitrophenol = 0.71, p-nitrophenol = 7.1, phenol = 10.0, p-cresol = 10.2.

∴ Order of acidity: 2,4,6-trinitrophenol > p-nitrophenol > phenol > p-cresol.

∴ 2,4,6-Trinitrophenol (picric acid) is the most acidic.

Answer: (3)

Keep practising — Alcohols, Phenols and Ethers

Ques. 2NEET 2016 (Phase 1)

The reaction [figure] can be classified as

  1. dehydration reaction
  2. Williamson alcohol synthesis reaction
  3. Williamson ether synthesis reaction
  4. alcohol formation reaction.
Ques. 3AIPMT 2015

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

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

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
Ques. 5AIPMT 2015 (Cancelled)

The reaction, [figure] is called

  1. Etard reaction
  2. Gattermann-Koch reaction
  3. Williamson synthesis
  4. Williamson continuous etherification process
Ques. 6AIPMT 2014

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
Ques. 7AIPMT 2014

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
Ques. 8AIPMT 2014

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
Ques. 9NEET 2013

Among the following ethers, which one will produce methyl alcohol on treatment with hot concentrated HI?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 10AIPMT 2012 (Mains)

Which of the following compounds can be used as antifreeze in automobile radiators?

  1. Methyl alcohol
  2. Glycol
  3. Nitrophenol
  4. Ethyl alcohol
Ques. 11AIPMT 2012 (Prelims)

In the following reaction [figure] The major product is

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

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