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JAMB Chemistry 1978 Question 25

Question 25

Hydrocarbons

Which of the following is not a member of the homologous series of the paraffins (alkanes)?

  1. A.C3H8
  2. B.C5H12
  3. C.C7H16
  4. D.C15H32
  5. E.C24H48
Show the answer and explanation

Answer: E (C24H48)

Explanation

Alkanes have the formula CnH2n+2. For n = 24 that would be C24H50; C24H48 fits CnH2n, which is not an alkane.