passwella.
Menu

JAMB Chemistry 1998 Question 44

Question 44

Hydrocarbons

One mole of a hydrocarbon contains 6g of hydrogen. If the molecular weight is 54, the hydrocarbon is an

  1. A.alkanone
  2. B.alkane
  3. C.alkene
  4. D.alkyne
Show the answer and explanation

Answer: D (alkyne)

Explanation

6 g of H means 6 H atoms. 54 − 6 = 48 g of carbon = 4 C atoms, so the formula is C4H6, which fits CnH2n−2, an alkyne (butyne).