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Alcohols, Phenols and Ethers

AIPMT 2002MCQEasy📈 Topic in 12% papers+4−1
Ques. 1AIPMT 2002

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

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

Answer

(2) salicylaldehyde

Solution

This is the Reimer–Tiemann reaction.

As per NCERT, on treating phenol with chloroform in the presence of sodium hydroxide, a -CHO group is introduced at the ortho position of the benzene ring; the intermediate is hydrolysed in the presence of alkali to give salicylaldehyde (2-hydroxybenzaldehyde).

C6H5OH [(ii) H+](i) CHCl3, aq. NaOH o-HOC6H4CHO

Answer: (2)

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Ques. 2AIPMT 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. 3AIPMT 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. 4AIPMT 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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