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JAMB Chemistry 2012 Question 45

Question 45

Hydrocarbons

The alkyne that will give a white precipitate silver trioxonitrate(V) is

  1. A.CH3CH2C ≡ CCH2CH3
  2. B.CH3C ≡ CCH2CH2CH3
  3. C.CH3CH2CH2CH2C ≡ CH
  4. D.CH3CH2CH2C ≡ CCH2CH3
Show the answer and explanation

Answer: C (CH3CH2CH2CH2C ≡ CH)

Explanation

Only a terminal alkyne (−C≡CH) has the acidic hydrogen that is replaced by silver to give a white silver alkynide precipitate.