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Alcohols, Phenols and Ethers · Question 50

AIPMT 2003MCQMedium📈 Topic in 25% papers+4−1
1

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

Answer

(4) CH3- C2H5 |C(OH)C6H5

Solution

CH3COOH + PCl5 CH3COCl (A) + POCl3 + HCl

Friedel–Crafts acylation: CH3COCl + C6H6 Anh. AlCl3 CH3COC6H5 (B) + HCl

Grignard addition to the ketone, then hydrolysis of the adduct, gives a 3° alcohol:

CH3COC6H5 C2H5MgBr CH3C(C2H5)(OMgBr)C6H5

H2O CH3C(C2H5)(OH)C6H5 (C)

C is 2-phenylbutan-2-ol.

Answer: (4)

AIPMT 2003

Keep practising — Alcohols, Phenols and Ethers

2

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

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

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

  1. benzaldehyde
  2. salicylaldehyde
  3. salicylic acid
  4. benzoic acid
AIPMT 2002
4

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
AIPMT 2001
5

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.
AIPMT 2001
6

Which reagent converts propene to 1-propanol ?

  1. H2O, H2SO4
  2. B2H6, H2O2, OH-
  3. Hg(OAc)2, NaBH4/H2O
  4. Aq. KOH
AIPMT 2000

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