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BITSAT2018ChemistryAldehydes and KetonesActual

An unsaturated hydrocarbon ' X ' gives white precipitate with Tollen's reagent. If X is gaseous in nature, the molecular formula of X is

Options

  1. AC 3 H 6
  2. BC 2 H 4
  3. CC 2 H 2
  4. DC 4 H 8

Correct answer

C. C 2 H 2

Step-by-step solution

Tollen's reagent consists of a solution of silver nitrate and ammonia. Terminal alkynes react with tollen's reagent and form white color precipitate. With Tollen's reagent (ammoniacal AgNO 3 ), a white precipitate of silver salt is obtained. H - C ≡ C - H + 2 AgNO 3 + 2 NH 4 OH → Ag - C ≡ C - Ag Sliver   acetylide   ( white   ppt . ) + 2 NH 4 NO 3 + H 2 O

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