passwella.
Menu

JAMB Chemistry 2002 Question 35

Question 35

Hydrocarbons

A red precipitate of copper (I) carbide is formed when ammonium solution of copper (I) chloride is introduced into

  1. A.CH3CH2CH2CH3
  2. B.CH2=CH−CH2CH3
  3. C.CH3CH2−C≡CH
  4. D.CH3−C≡C−CH3
Show the answer and explanation

Answer: C (CH3CH2−C≡CH)

Explanation

Only alkynes with a hydrogen on the triple-bonded carbon (terminal alkynes, —C≡CH) form copper (I) carbide. But-1-yne has one; but-2-yne does not.