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JAMB Chemistry 1998 Question 42

Question 42

Alkanols

Dehydration of CH3-CH2-CH2-CH2-OH gives

  1. A.CH2 = CH-CH2-CH3
  2. B.CH3CH≡CH-CH3
  3. C.H-C≡C-CH2-CH3
  4. D.CH3C≡C-CH3
Show the answer and explanation

Answer: A (CH2 = CH-CH2-CH3)

Explanation

Removing a water molecule from butan-1-ol (the OH and an H from the next carbon) forms a C=C double bond, giving but-1-ene, CH2=CHCH2CH3. Dehydration gives an alkene, not an alkyne.