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Alcohols, Phenols and Ethers · Question 48

AIPMT 2004MCQEasy📈 Topic in 0% papers+4−1
1

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

Answer

(3) CH3OH

Solution

The yellow precipitate is iodoform, CHI3. As per NCERT, alcohols having the CH3-CH(OH)- group (oxidised by I2/NaOH to CH3CO-) give the iodoform test.

(1) CH3CH(OH)CH3 — has CH3CH(OH)- ⇒ positive

(2) CH3CH2CH(OH)CH3 — has CH3CH(OH)- ⇒ positive

(4) CH3CH2OH — has CH3CH(OH)- (with H) ⇒ positive

(3) CH3OH — no CH3-CH(OH) unit ⇒ no iodoform

Answer: (3)

AIPMT 2004

Keep practising — Alcohols, Phenols and Ethers

2

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
AIPMT 2004
3

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
AIPMT 2003
4

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
5

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

  1. benzaldehyde
  2. salicylaldehyde
  3. salicylic acid
  4. benzoic acid
AIPMT 2002
6

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
7

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
8

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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