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Alcohols, Phenols and Ethers

AIPMT 2010 (Prelims)MCQEasy📈 Topic in 25% papers+4−1
Ques. 1AIPMT 2010 (Prelims)

Which of the following compounds has the most acidic nature?

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

Answer

(2) [figure]

Solution

Phenol is the most acidic of these: the phenoxide ion is stabilised by delocalisation of the negative charge over the benzene ring.

Benzyl alcohol, cyclohexanol and dicyclohexylmethanol are alcohols; in their alkoxide ions the negative charge stays on oxygen (no resonance), so they are much weaker acids.

Answer: (2)

Keep practising — Alcohols, Phenols and Ethers

Ques. 2AIPMT 2009

Consider the following reaction : Phenol Zn dust X [Anhyd. AlCl3]CH3Cl Y Alkaline KMnO4 Z the product Z is

  1. benzaldehyde
  2. benzoic acid
  3. benzene
  4. toluene
Ques. 3AIPMT 2009

HOCH2CH2OH on heating with periodic acid gives

  1. 2HCOOH
  2. [figure]
  3. [figure]
  4. 2CO2
Ques. 4AIPMT 2009

Consider the following reaction : Ethanol PBr3 X alc. KOH Y [(ii) H2O, heat](i) H2SO4, room temperature Z the product Z is

  1. CH3CH2-O-CH2-CH3
  2. CH3-CH2-O-SO3H
  3. CH3CH2OH
  4. CH2=CH2
Ques. 5AIPMT 2007

In the reaction : CH3- CH3 |CH-CH2-O-CH2-CH3 + HI heated Which of the following compounds will be formed?

  1. CH3- CH3 |CH-CH3 + CH3CH2OH
  2. CH3- CH3 |CH-CH2OH + CH3CH3
  3. CH3- CH3 |CH-CH2OH + CH3CH2I
  4. CH3- CH3 |CH-CH2-I + CH3CH2OH
Ques. 6AIPMT 2006

Ethylene oxide when treated with Grignard reagent yields

  1. primary alcohol
  2. secondary alcohol
  3. tertiary alcohol
  4. cyclopropyl alcohol
Ques. 7AIPMT 2006

The major organic product in the reaction is CH3-O-CH(CH3)2 + HI products

  1. CH3I + (CH3)2CHOH
  2. CH3OH + (CH3)2CHI
  3. ICH2OCH(CH3)2
  4. CH3O I |C(CH3)2
Ques. 8AIPMT 2005

Which one of the following compounds is most acidic?

  1. Cl-CH2-CH2-OH
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 9AIPMT 2004

The -OH group of an alcohol or the -COOH group of a carboxylic acid can be replaced by -Cl using

  1. phosphorus pentachloride
  2. hypochlorous acid
  3. chlorine
  4. hydrochloric acid
Ques. 10AIPMT 2004

Which one of the following will not form a yellow precipitate on heating with an alkaline solution of iodine?

  1. CH3CH(OH)CH3
  2. CH3CH2CH(OH)CH3
  3. CH3OH
  4. CH3CH2OH
Ques. 11AIPMT 2004

Which one of the following can be oxidised to the corresponding carbonyl compound?

  1. 2-Hydroxypropane
  2. ortho-Nitrophenol
  3. Phenol
  4. 2-Methyl-2-hydroxypropane

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