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Alcohols, Phenols and Ethers · Question 52

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

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)

AIPMT 2002

Keep practising — Alcohols, Phenols and Ethers

2

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
3

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
4

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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