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Alcohols, Phenols and Ethers

AIPMT 2004MCQEasy📈 Topic in 38% papers+4−1
Ques. 1AIPMT 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

Answer

(1) phosphorus pentachloride

Solution

As per NCERT, phosphorus pentachloride replaces the –OH group of alcohols and of carboxylic acids by –Cl:

R-OH + PCl5 R-Cl + POCl3 + HCl

R-COOH + PCl5 R-COCl + POCl3 + HCl

(In -COOH it is the –OH part that is replaced, giving the acid chloride.)

HCl works only with alcohols (needs ZnCl2 for 1° and 2°) and does not convert acids into acid chlorides; HOCl and Cl2 do not replace –OH.

Answer: (1)

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Ques. 2AIPMT 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. 3AIPMT 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
Ques. 4AIPMT 2003

In a set of the given reactions, acetic acid yielded a product C. CH3COOH + PCl5 A [Anh. AlCl3]C6H6 B [ether]C2H5MgBr C Product C would be

  1. CH3CH(OH)C2H5
  2. CH3COC6H5
  3. CH3CH(OH)C6H5
  4. CH3- C2H5 |C(OH)C6H5
Ques. 5AIPMT 2002

n-Propyl alcohol and isopropyl alcohol can be chemically distinguished by which reagent?

  1. PCl5
  2. reduction
  3. oxidation with potassium dichromate
  4. ozonolysis
Ques. 6AIPMT 2002

When phenol is treated with CHCl3 and NaOH, the product formed is

  1. benzaldehyde
  2. salicylaldehyde
  3. salicylic acid
  4. benzoic acid
Ques. 7AIPMT 2001

In preparation of alkene from alcohol using Al2O3 which is the effective factor ?

  1. Porosity of Al2O3
  2. Temperature
  3. Concentration
  4. Surface area of Al2O3
Ques. 8AIPMT 2001

Which of the following is correct?

  1. On reduction, any aldehyde gives secondary alcohol.
  2. Reaction of vegetable oil with H2SO4 gives glycerine
  3. Alcoholic iodine with NaOH gives iodoform.
  4. Sucrose on reaction with NaCl gives invert sugar.
Ques. 9AIPMT 2000

Which reagent converts propene to 1-propanol ?

  1. H2O, H2SO4
  2. B2H6, H2O2, OH-
  3. Hg(OAc)2, NaBH4/H2O
  4. Aq. KOH

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