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Principles Related to Practical Chemistry · Question 28

AIPMT 2001MCQEasy📈 Topic in 12% papers+4−1
1

Which of the following is incorrect?

  1. FeCl3 is used in detection of phenol.
  2. Fehling's solution is used in detection of glucose.
  3. Tollens' reagent is used in detection of unsaturation.
  4. NaHSO3 is used in detection of carbonyl compound.

Answer

(3) Tollens' reagent is used in detection of unsaturation.

Solution

(1) Phenol gives a violet colour with neutral FeCl3 solution ⇒ correct.

(2) Glucose (a reducing sugar, –CHO group) reduces Fehling's solution to a red precipitate of Cu2O ⇒ correct.

(3) Tollens' reagent (ammoniacal silver nitrate) is used to detect aldehydes (silver mirror test), not unsaturation; unsaturation is detected by bromine water or Baeyer's reagent ⇒ incorrect.

(4) Aldehydes and ketones form crystalline addition products with NaHSO3 ⇒ correct.

Answer: (3)

AIPMT 2001

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2

In steam distillation of toluene, the pressure of toluene in vapour is

  1. equal to pressure of barometer
  2. less than pressure of barometer
  3. equal to vapour pressure of toluene in simple distillation
  4. more than vapour pressure of toluene in simple distillation.
AIPMT 2001

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